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The Mediterranean Sea is a
sea The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, ...
connected to the Atlantic Ocean, surrounded by the
Mediterranean Basin In biogeography, the Mediterranean Basin (; also known as the Mediterranean Region or sometimes Mediterranea) is the region of lands around the Mediterranean Sea that have mostly a Mediterranean climate, with mild to cool, rainy winters and w ...
and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on the east by the Levant. The Sea has played a central role in the history of Western civilization. Geological evidence indicates that around 5.9 million years ago, the Mediterranean was cut off from the Atlantic and was partly or completely
desiccated Desiccation () is the state of extreme dryness, or the process of extreme drying. A desiccant is a hygroscopic (attracts and holds water) substance that induces or sustains such a state in its local vicinity in a moderately sealed container. ...
over a period of some 600,000 years during the Messinian salinity crisis before being refilled by the Zanclean flood about 5.3 million years ago. The Mediterranean Sea covers an area of about , representing 0.7% of the global ocean surface, but its connection to the Atlantic via the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
—the narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates the Iberian Peninsula in Europe from Morocco in Africa—is only wide. The Mediterranean Sea encompasses a vast number of islands, some of them being of volcanic origin. The two by far largest islands are Sicily and Sardinia. The Mediterranean Sea has an average depth of and the deepest recorded point is ± in the
Calypso Deep Calypso Deep, located in the Hellenic Trench, Ionian Sea 62.6 km south-west of Pylos, Greece, is the deepest part of the Mediterranean Sea, with a maximum depth of , at . Crewed descents The first crewed descent into Calypso Deep was on 27 Sep ...
in the
Ionian Sea The Ionian Sea ( el, Ιόνιο Πέλαγος, ''Iónio Pélagos'' ; it, Mar Ionio ; al, Deti Jon ) is an elongated bay of the Mediterranean Sea. It is connected to the Adriatic Sea to the north, and is bounded by Southern Italy, including C ...
. It lies between latitudes 30° and 46° N and longitudes 6° W and 36° E. Its west–east length, from the Strait of Gibraltar to the Gulf of Alexandretta, on the southeastern coast of Turkey, is about . The north–south length varies greatly between different shorelines and whether only straight routes are considered. Also including longitudal changes, the shortest shipping route between the multinational Gulf of Trieste and the Libyan coastline of
Gulf of Sidra The Gulf of Sidra ( ar, خليج السدرة, Khalij as-Sidra, also known as the Gulf of Sirte ( ar, خليج سرت, Khalij Surt, is a body of water in the Mediterranean Sea on the northern coast of Libya, named after the oil port of Sidra or ...
is about . The water temperatures are mild in winter and warm in summer and give name to the mediterranean climate type due to the majority of precipitation falling in the cooler months. Its southern and eastern coastlines are lined with hot deserts not far inland, but the immediate coastline on all sides of the Mediterranean tends to have strong maritime moderation. The sea was an important route for
merchant A merchant is a person who trades in commodities produced by other people, especially one who trades with foreign countries. Historically, a merchant is anyone who is involved in business or trade. Merchants have operated for as long as indust ...
s and travelers of ancient times, facilitating trade and cultural exchange between peoples of the region. The history of the Mediterranean region is crucial to understanding the origins and development of many modern societies. The Roman Empire maintained nautical hegemony over the sea for centuries. The countries surrounding the Mediterranean in clockwise order are Spain, France, Monaco, Italy, Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, Albania, Greece, Turkey,
Syria Syria ( ar, سُورِيَا or سُورِيَة, translit=Sūriyā), officially the Syrian Arab Republic ( ar, الجمهورية العربية السورية, al-Jumhūrīyah al-ʻArabīyah as-Sūrīyah), is a Western Asian country loc ...
, Lebanon, Israel,
Palestine __NOTOC__ Palestine may refer to: * State of Palestine, a state in Western Asia * Palestine (region), a geographic region in Western Asia * Palestinian territories, territories occupied by Israel since 1967, namely the West Bank (including East ...
, Egypt, Libya, Tunisia, Algeria, and Morocco; Malta and Cyprus are island countries in the sea. In addition, the disputed territory of
North Cyprus Northern Cyprus ( tr, Kuzey Kıbrıs), officially the Turkish Republic of Northern Cyprus (TRNC; tr, Kuzey Kıbrıs Türk Cumhuriyeti, ''KKTC''), is a ''de facto'' state that comprises the northeastern portion of the island of Cyprus. Recog ...
, and some exclaves, notably
Gibraltar ) , anthem = " God Save the King" , song = " Gibraltar Anthem" , image_map = Gibraltar location in Europe.svg , map_alt = Location of Gibraltar in Europe , map_caption = United Kingdom shown in pale green , mapsize = , image_map2 = Gib ...
and Ceuta, have coastlines on the sea. Alexandria is the largest coastal settlement. The drainage basin encompasses a large number of other countries, the Nile being the longest river ending in the Mediterranean Sea.


History


Ancient civilizations

Major ancient civilizations were located around the Mediterranean. The sea provided routes for trade, colonization, and war, as well as food (from fishing and the gathering of other seafood) for numerous communities throughout the ages. The most notable Mediterranean civilizations in classical antiquity were the Greek city states, Persians and the Phoenicians, both of which extensively colonized the coastlines of the Mediterranean.
Darius I of Persia Darius I ( peo, 𐎭𐎠𐎼𐎹𐎺𐎢𐏁 ; grc-gre, Δαρεῖος ; – 486 BCE), commonly known as Darius the Great, was a Persian ruler who served as the third King of Kings of the Achaemenid Empire, reigning from 522 BCE until his d ...
, who conquered Ancient Egypt, built a canal linking the Mediterranean to the Red Sea. Darius's canal was wide enough for two triremes to pass each other with oars extended, and required four days to traverse. Later, when Augustus founded the Roman Empire, the Romans referred to the Mediterranean as '' Mare Nostrum'' ("Our Sea"). For the next 400 years, the Roman Empire completely controlled the Mediterranean Sea and virtually all its coastal regions from Gibraltar to the Levant. In 2019, the archaeological team of experts from Underwater Research Center of the Akdeniz University (UA) revealed a
shipwreck A shipwreck is the wreckage of a ship that is located either beached on land or sunken to the bottom of a body of water. Shipwrecking may be intentional or unintentional. Angela Croome reported in January 1999 that there were approximately ...
dating back 3,600 years in the Mediterranean Sea in Turkey. 1.5 tons of copper ingots found in the ship were used to estimate its age. The
Governor of Antalya The Governor of Antalya ( Turkish: ''Antalya Valiliği'') is the bureaucratic state official responsible for both national government and state affairs in the Province of Antalya. Similar to the Governors of the 80 other Provinces of Turkey, the ...
Munir Karaloğlu described this valuable discovery as the " Göbeklitepe of the underwater world”. It has been confirmed that the shipwreck, dating back to 1600 BC, is older than the "
Uluburun Shipwreck The Uluburun Shipwreck is a Late Bronze Age shipwreck dated to the late 14th century BC, discovered close to the east shore of Uluburun (Grand Cape), Turkey, in the Mediterranean Sea. The shipwreck was discovered in the summer of 1982 by Mehmed Ç ...
" dating back to 1400 BC.


Middle Ages and empires

The Western Roman Empire collapsed around 476 AD. The east was again dominant as Roman power lived on in the Byzantine Empire formed in the 4th century from the eastern half of the Roman Empire. Another power arose in the 7th century, and with it the religion of
Islam Islam (; ar, ۘالِإسلَام, , ) is an Abrahamic religions, Abrahamic Monotheism#Islam, monotheistic religion centred primarily around the Quran, a religious text considered by Muslims to be the direct word of God in Islam, God (or ...
, which soon swept across from the east; at its greatest extent, the Arabs, under the Umayyads, controlled most of the Mediterranean region and left a lasting footprint on its eastern and southern shores. The
Arab invasions The spread of Islam spans about 1,400 years. Muslim conquests following Muhammad's death led to the creation of the caliphates, occupying a vast geographical area; conversion to Islam was boosted by Arab Muslim forces conquering vast territories ...
disrupted the trade relations between Western and Eastern Europe while disrupting trade routes with Eastern Asian Empires. This, however, had the indirect effect of promoting the trade across the Caspian Sea. The export of grains from Egypt was re-routed towards the Eastern world. Products from East Asian empires, like silk and spices, were carried from Egypt to ports like
Venice Venice ( ; it, Venezia ; vec, Venesia or ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 small islands that are separated by canals and linked by over 400  ...
and Constantinople by sailors and Jewish merchants. The
Viking raids The Viking Age () was the period during the Middle Ages when Norsemen known as Vikings undertook large-scale raiding, colonizing, conquest, and trading throughout Europe and reached North America. It followed the Migration Period and the Germ ...
further disrupted the trade in western Europe and brought it to a halt. However, the Norsemen developed the trade from Norway to the White Sea, while also trading in luxury goods from Spain and the Mediterranean. The Byzantines in the mid-8th century retook control of the area around the north-eastern part of the Mediterranean. Venetian ships from the 9th century armed themselves to counter the harassment by Arabs while concentrating trade of Asian goods in Venice. The
Fatimids The Fatimid Caliphate was an Isma'ilism, Ismaili Shia Islam, Shi'a caliphate extant from the tenth to the twelfth centuries AD. Spanning a large area of North Africa, it ranged from the Atlantic Ocean in the west to the Red Sea in the ea ...
maintained trade relations with the
Italian city-states The Italian city-states were numerous political and independent territorial entities that existed in the Italian Peninsula from the beginning of the Middle Ages until the proclamation of the Kingdom of Italy, which took place in 1861. After the ...
like Amalfi and Genoa before the Crusades, according to the Cairo Geniza documents. A document dated 996 mentions Amalfian merchants living in Cairo. Another letter states that the Genoese had traded with Alexandria. The caliph al-Mustansir had allowed Amalfian merchants to reside in Jerusalem about 1060 in place of the Latin
hospice Hospice care is a type of health care that focuses on the palliation of a terminally ill patient's pain and symptoms and attending to their emotional and spiritual needs at the end of life. Hospice care prioritizes comfort and quality of life by ...
. The Crusades led to flourishing of trade between Europe and the '' outremer'' region. Genoa, Venice and
Pisa Pisa ( , or ) is a city and ''comune'' in Tuscany, central Italy, straddling the Arno just before it empties into the Ligurian Sea. It is the capital city of the Province of Pisa. Although Pisa is known worldwide for its leaning tower, the cit ...
created colonies in regions controlled by the Crusaders and came to control the trade with the Orient. These colonies also allowed them to trade with the Eastern world. Though the fall of the Crusader states and attempts at banning of trade relations with Muslim states by the Popes temporarily disrupted the trade with the Orient, it however continued. Europe started to revive, however, as more organized and centralized states began to form in the later Middle Ages after the
Renaissance of the 12th century The Renaissance ( , ) , from , with the same meanings. is a period in European history marking the transition from the Middle Ages to modernity and covering the 15th and 16th centuries, characterized by an effort to revive and surpass ideas ...
. Ottoman power based in Anatolia continued to grow, and in 1453 extinguished the Byzantine Empire with the Conquest of Constantinople. Ottomans gained control of much of the sea in the 16th century and maintained naval bases in
southern France Southern France, also known as the South of France or colloquially in French language, French as , is a defined geographical area consisting of the regions of France that border the Atlantic Ocean south of the Marais Poitevin,Louis Papy, ''Le midi ...
(1543–1544), Algeria and Tunisia. Barbarossa, the famous Ottoman captain is a symbol of this domination with the victory of the
Battle of Preveza The Battle of Preveza was a naval battle that took place on 28 September 1538 near Preveza in Ionian Sea in northwestern Greece between an Ottoman fleet and that of a Holy League assembled by Pope Paul III. It occurred in the same area in ...
(1538). The
Battle of Djerba The Battle of Djerba ( tr, Cerbe) took place in May 1560 near the island of Djerba, Tunisia. The Ottomans under Piyale Pasha's command overwhelmed a large joint Christian Alliance fleet, composed chiefly of Spanish, Papal, Genoese, Maltese, ...
(1560) marked the apex of Ottoman naval domination in the Mediterranean. As the naval prowess of the European powers increased, they confronted Ottoman expansion in the region when the Battle of Lepanto (1571) checked the power of the Ottoman Navy. This was the last naval battle to be fought primarily between
galley A galley is a type of ship that is propelled mainly by oars. The galley is characterized by its long, slender hull, shallow draft, and low freeboard (clearance between sea and gunwale). Virtually all types of galleys had sails that could be used ...
s. The
Barbary pirates The Barbary pirates, or Barbary corsairs or Ottoman corsairs, were Muslim pirates and privateers who operated from North Africa, based primarily in the ports of Salé, Rabat, Algiers, Tunis and Tripoli, Libya, Tripoli. This area was known i ...
of Northwest Africa preyed on Christian shipping and coastlines in the Western Mediterranean Sea. According to Robert Davis, from the 16th to 19th centuries, pirates captured 1 million to 1.25 million Europeans as slaves. The development of oceanic shipping began to affect the entire Mediterranean. Once, most of the trade between Western Europe and the East was passing through the region, but after the 1490s the development of a sea route to the Indian Ocean allowed the importation of Asian spices and other goods through the Atlantic ports of western Europe. The sea remained strategically important. British mastery of
Gibraltar ) , anthem = " God Save the King" , song = " Gibraltar Anthem" , image_map = Gibraltar location in Europe.svg , map_alt = Location of Gibraltar in Europe , map_caption = United Kingdom shown in pale green , mapsize = , image_map2 = Gib ...
ensured their influence in Africa and Southwest Asia. Especially after the naval battles of Abukir (1799,
Battle of the Nile The Battle of the Nile (also known as the Battle of Aboukir Bay; french: Bataille d'Aboukir) was a major naval battle fought between the British Royal Navy and the Navy of the French Republic at Aboukir Bay on the Mediterranean coast off the ...
) and
Trafalgar Trafalgar most often refers to: * Battle of Trafalgar (1805), fought near Cape Trafalgar, Spain * Trafalgar Square, a public space and tourist attraction in London, England It may also refer to: Music * ''Trafalgar'' (album), by the Bee Gees Pl ...
(1805), the British had for a long time strengthened their dominance in the Mediterranean. Wars included
Naval warfare in the Mediterranean during World War I The First battle of the Mediterranean During WW1 was between the Central Powers' navies of Austria-Hungary, Germany and the Ottoman Empire and the Allied navies of Italy, France, Greece, Japan, America and the British Empire. Austro-Hungarian I ...
and Mediterranean theatre of World War II. With the opening of the lockless
Suez Canal The Suez Canal ( arz, قَنَاةُ ٱلسُّوَيْسِ, ') is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The long canal is a popular ...
in 1869, the flow of trade between Europe and Asia changed fundamentally. The fastest route now led through the Mediterranean towards East Africa and Asia. This led to a preference for the Mediterranean countries and their ports like Trieste with the direct connections to Central and Eastern Europe experienced a rapid economic rise. In the 20th century, the 1st and 2nd World War as well as the
Suez Crisis The Suez Crisis, or the Second Arab–Israeli war, also called the Tripartite Aggression ( ar, العدوان الثلاثي, Al-ʿUdwān aṯ-Ṯulāṯiyy) in the Arab world and the Sinai War in Israel,Also known as the Suez War or 1956 Wa ...
and the
Cold War The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term '' cold war'' is used because the ...
led to a shift of trade routes to the European northern ports, which changed again towards the southern ports through European integration, the activation of the
Silk Road The Silk Road () was a network of Eurasian trade routes active from the second century BCE until the mid-15th century. Spanning over 6,400 kilometers (4,000 miles), it played a central role in facilitating economic, cultural, political, and reli ...
and free world trade.


21st century and migrations

In 2013, the
Maltese Maltese may refer to: * Someone or something of, from, or related to Malta * Maltese alphabet * Maltese cuisine * Maltese culture * Maltese language, the Semitic language spoken by Maltese people * Maltese people, people from Malta or of Malte ...
president described the Mediterranean Sea as a "cemetery" due to the large number of migrants who drowned there after their boats capsized. European Parliament president Martin Schulz said in 2014 that Europe's migration policy "turned the Mediterranean into a graveyard", referring to the number of drowned refugees in the region as a direct result of the policies. An Azerbaijani official described the sea as "a burial ground ... where people die". Following the
2013 Lampedusa migrant shipwreck On 3 October 2013, a boat carrying migrants from Libya to Italy sank off the Italian island of Lampedusa. It was reported that the boat had sailed from Misrata, Libya, but that many of the migrants were originally from Eritrea, Somalia and Ghana. ...
, the Italian government decided to strengthen the national system for the patrolling of the Mediterranean Sea by authorising " Operation Mare Nostrum", a military and humanitarian mission in order to rescue the migrants and arrest the traffickers of immigrants. In 2015, more than one million migrants crossed the Mediterranean Sea into Europe. Italy was particularly affected by the European migrant crisis. Since 2013, over 700,000 migrants have landed in Italy, mainly sub-Saharan Africans.


Geography

The Mediterranean Sea connects: * to the Atlantic Ocean by the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
(known in Homer's writings as the " Pillars of Hercules") in the west * to the Sea of Marmara and the Black Sea, by the Straits of the Dardanelles and the Bosporus respectively, in the east The long artificial
Suez Canal The Suez Canal ( arz, قَنَاةُ ٱلسُّوَيْسِ, ') is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The long canal is a popular ...
in the southeast connects the Mediterranean Sea to the Red Sea without ship lock, because the water level is essentially the same. The westernmost point of the Mediterranean is located at the transition from the Alborán Sea to the Strait of Gibraltar, the easternmost point is on the coast of the
Gulf of Iskenderun A gulf is a large inlet from the ocean into the landmass, typically with a narrower opening than a bay, but that is not observable in all geographic areas so named. The term gulf was traditionally used for large highly-indented navigable bodies ...
in southeastern Turkey. The northernmost point of the Mediterranean is on the coast of the Gulf of Trieste near Monfalcone in northern Italy while the southernmost point is on the coast of the
Gulf of Sidra The Gulf of Sidra ( ar, خليج السدرة, Khalij as-Sidra, also known as the Gulf of Sirte ( ar, خليج سرت, Khalij Surt, is a body of water in the Mediterranean Sea on the northern coast of Libya, named after the oil port of Sidra or ...
near the Libyan town of El Agheila. Large islands in the Mediterranean include: * Cyprus, Crete, Euboea, Rhodes, Lesbos, Chios,
Kefalonia Kefalonia or Cephalonia ( el, Κεφαλονιά), formerly also known as Kefallinia or Kephallenia (), is the largest of the Ionian Islands in western Greece and the 6th largest island in Greece after Crete, Euboea, Lesbos, Rhodes and Chios. It ...
,
Corfu Corfu (, ) or Kerkyra ( el, Κέρκυρα, Kérkyra, , ; ; la, Corcyra.) is a Greek island in the Ionian Sea, of the Ionian Islands, and, including its small satellite islands, forms the margin of the northwestern frontier of Greece. The isl ...
, Limnos, Samos, Naxos, and Andros in the
Eastern Mediterranean Eastern Mediterranean is a loose definition of the eastern approximate half, or third, of the Mediterranean Sea, often defined as the countries around the Levantine Sea. It typically embraces all of that sea's coastal zones, referring to communi ...
* Sicily, Cres, Krk, Brač, Hvar, Pag, Korčula, and Malta in the central Mediterranean * Sardinia,
Corsica Corsica ( , Upper , Southern ; it, Corsica; ; french: Corse ; lij, Còrsega; sc, Còssiga) is an island in the Mediterranean Sea and one of the 18 regions of France. It is the fourth-largest island in the Mediterranean and lies southeast of ...
, and the
Balearic Islands The Balearic Islands ( es, Islas Baleares ; or ca, Illes Balears ) are an archipelago in the Balearic Sea, near the eastern coast of the Iberian Peninsula. The archipelago is an autonomous community and a province of Spain; its capital is ...
:
Ibiza Ibiza (natively and officially in ca, Eivissa, ) is a Spanish island in the Mediterranean Sea off the eastern coast of the Iberian Peninsula. It is from the city of Valencia. It is the third largest of the Balearic Islands, in Spain. Its l ...
,
Majorca Mallorca, or Majorca, is the largest island in the Balearic Islands, which are part of Spain and located in the Mediterranean. The capital of the island, Palma, is also the capital of the autonomous community of the Balearic Islands. The Bal ...
, and Menorca in the Western Mediterranean The Alpine arc, which also has a great meteorological impact on the Mediterranean area, touches the Mediterranean in the west in the area around Nice. The typical Mediterranean climate has hot, dry summers and mild, rainy winters. Crops of the region include
olive The olive, botanical name ''Olea europaea'', meaning 'European olive' in Latin, is a species of small tree or shrub in the family Oleaceae, found traditionally in the Mediterranean Basin. When in shrub form, it is known as ''Olea europaea'' ...
s, grapes, oranges, tangerines,
carob The carob ( ; ''Ceratonia siliqua'') is a flowering evergreen tree or shrub in the Caesalpinioideae sub-family of the legume family, Fabaceae. It is widely cultivated for its edible fruit pods, and as an ornamental tree in gardens and landscap ...
s and
cork Cork or CORK may refer to: Materials * Cork (material), an impermeable buoyant plant product ** Cork (plug), a cylindrical or conical object used to seal a container ***Wine cork Places Ireland * Cork (city) ** Metropolitan Cork, also known as G ...
. Although the Mediterranean is sometimes considered a part of the Atlantic Ocean , it is usually referred to as a separate body of water.


Marginal seas

The Mediterranean Sea includes 15
marginal seas This is a list of seas of the World Ocean, including marginal seas, areas of water, various gulfs, bights, bays, and straits. Terminology * Ocean – the four to seven largest named bodies of water in the World Ocean, all of which have "Ocean ...
: *
List of seas This is a list of seas of the World Ocean, including marginal seas, areas of water, various gulfs, bights, bays, and straits. Terminology * Ocean – the four to seven largest named bodies of water in the World Ocean, all of which have "Ocean ...
* Marginal seas of the Mediterranean * Gulfs of the Mediterranean * Straits of the Mediterranean Sea * Channels of the Mediterranean Sea Note 1: The International Hydrographic Organization defines the area as generic Mediterranean Sea, in the Western Basin. It does not recognize the label
Sea of Sardinia The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, ...
. Note 2:
Thracian Sea 250px, Thracian Sea satellite picture The Thracian Sea ( el, Θρακικό Πέλαγος, ''Thrakiko Pelagos''; tr, Trakya Denizi) is the northernmost part of the Aegean Sea. It is bounded by Macedonia and Thrace as well as northwestern Tur ...
and Myrtoan Sea are
seas This is a list of seas of the World Ocean, including marginal seas, areas of water, various gulfs, bights, bays, and straits. Terminology * Ocean – the four to seven largest named bodies of water in the World Ocean, all of which have "Ocean ...
that are part of the Aegean Sea. Note 3: The Black Sea is not considered part of it.


Extent

The International Hydrographic Organization defines the limits of the Mediterranean Sea as follows: Stretching from the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
in the west to the entrances to the Dardanelles and the
Suez Canal The Suez Canal ( arz, قَنَاةُ ٱلسُّوَيْسِ, ') is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The long canal is a popular ...
in the east, the Mediterranean Sea is bounded by the coasts of Europe, Africa, and Asia and is divided into two deep basins: * Western Basin: ** On the west: A line joining the extremities of
Cape Trafalgar Cape Trafalgar (; es, Cabo Trafalgar ) is a headland in the Province of Cádiz in the southwest of Spain. The 1805 naval Battle of Trafalgar, in which the Royal Navy commanded by Admiral Horatio Nelson decisively defeated Napoleon's combined Spa ...
(Spain) and
Cape Spartel Cape Spartel ( ar, رأس سبارطيل; french: Cap Spartel; ary, أشبرتال) is a promontory in Morocco about above sea level at the entrance to the Strait of Gibraltar, 12 km West of Tangier. Below the cape are the Caves of Hercules. ...
(Africa) ** On the northeast: The west coast of Italy. In the Strait of Messina, a line joining the north extreme of Cape Paci (15°42′E) with Cape Peloro, the east extreme of the Island of Sicily. The north coast of Sicily ** On the east: A line joining Cape Lilibeo the western point of Sicily (), through the Adventure Bank to
Cape Bon Cape Bon ("Good Cape") is a peninsula in far northeastern Tunisia, also known as Ras at-Taib ( ar, الرأس الطيب), Sharīk Peninsula, or Watan el Kibli; Cape Bon is also the name of the northernmost point on the peninsula, also known as Ra ...
(Tunisia) * Eastern Basin: ** On the west: The northeastern and eastern limits of the Western Basin ** On the northeast: A line joining
Kum Kale Kum may refer to: * Kum, a Slavic form of a godfather or a groomsman, similar to a blood brother * Kum., an abbreviation of the Indian honorific ''Kumari'', used for unmarried women * Kum (mountain), a mountain in Slovenia * Kum, Cantonese form of ...
(26°11′E) and Cape Helles, the western entrance to the Dardanelles ** On the southeast: The entrance to the
Suez Canal The Suez Canal ( arz, قَنَاةُ ٱلسُّوَيْسِ, ') is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The long canal is a popular ...
** On the east: The coasts of Lebanon,
Syria Syria ( ar, سُورِيَا or سُورِيَة, translit=Sūriyā), officially the Syrian Arab Republic ( ar, الجمهورية العربية السورية, al-Jumhūrīyah al-ʻArabīyah as-Sūrīyah), is a Western Asian country loc ...
, and Israel


Hydrography

The drainage basin of the Mediterranean Sea is particularly heterogeneous and extends much further than the Mediterranean region. Its size has been estimated between and , depending on whether non-active parts (deserts) are included or not. The longest river ending in the Mediterranean Sea is the Nile, which takes its sources in equatorial Africa. The basin of the Nile constitutes about two-thirds of the Mediterranean drainage basin and encompasses areas as high as the Ruwenzori Mountains. Among other important rivers in Africa, are the
Moulouya The Moulouya River (Berber language, Berber: ''iɣẓer en Melwect'', ) is a 520 km-long river in Morocco. Its sources are located in the Jbel Ayachi, Ayashi mountain in the Middle Atlas. It empties into the Mediterranean Sea near Saïdia, in ...
and the Chelif, both on the north side of the
Atlas Mountains The Atlas Mountains are a mountain range in the Maghreb in North Africa. It separates the Sahara Desert from the Mediterranean Sea and the Atlantic Ocean; the name "Atlantic" is derived from the mountain range. It stretches around through Moroc ...
. In Asia, are the Ceyhan and
Seyhan Seyhan is a district-municipality in the Adana Province of Turkey, core of the Adana urban area. Seyhan is home to 35 percent of the residents of Adana Province and almost half of the residents of the city of Adana. It is the fifth most populous ...
, both on the south side of the Taurus Mountains. In Europe, the largest basins are those of the Rhône, Ebro, Po, and Maritsa. The basin of the Rhône is the largest and extends up as far north as the
Jura Mountains The Jura Mountains ( , , , ; french: Massif du Jura; german: Juragebirge; it, Massiccio del Giura, rm, Montagnas da Jura) are a sub-alpine mountain range a short distance north of the Western Alps and mainly demarcate a long part of the Frenc ...
, encompassing areas even on the north side of the Alps. The basins of the Ebro, Po, and Maritsa, are respectively south of the Pyrenees, Alps, and
Balkan Mountains The Balkan mountain range (, , known locally also as Stara planina) is a mountain range in the eastern part of the Balkan Peninsula in Southeastern Europe. The range is conventionally taken to begin at the peak of Vrashka Chuka on the border betw ...
, which are the major ranges bordering Southern Europe. Total annual precipitation is significantly higher on the European part of the Mediterranean basin, especially near the Alps (the 'water tower of Europe') and other high mountain ranges. As a consequence, the river discharges of the Rhône and Po are similar to that of the Nile, despite the latter having a much larger basin. These are the only three rivers with an average discharge of over . Among large natural fresh bodies of water are
Lake Victoria Lake Victoria is one of the African Great Lakes. With a surface area of approximately , Lake Victoria is Africa's largest lake by area, the world's largest tropical lake, and the world's second-largest fresh water lake by surface area after ...
(Nile basin), Lake Geneva (Rhône), and the Italian Lakes (Po). While the Mediterranean watershed is bordered by other river basins in Europe, it is essentially bordered by endorheic basins or deserts elsewhere. The following countries are in the Mediterranean drainage basin while ''not'' having a coastline on the Mediterranean Sea: *In Europe, through various rivers: Andorra, Bulgaria, Kosovo, North Macedonia, San Marino, Serbia, and
Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...
. *In Africa, through the Nile:
Congo Congo or The Congo may refer to either of two countries that border the Congo River in central Africa: * Democratic Republic of the Congo, the larger country to the southeast, capital Kinshasa, formerly known as Zaire, sometimes referred to a ...
,
Burundi Burundi (, ), officially the Republic of Burundi ( rn, Repuburika y’Uburundi ; Swahili language, Swahili: ''Jamuhuri ya Burundi''; French language, French: ''République du Burundi'' ), is a landlocked country in the Great Rift Valley at the ...
,
Eritrea Eritrea ( ; ti, ኤርትራ, Ertra, ; ar, إرتريا, ʾIritriyā), officially the State of Eritrea, is a country in the Horn of Africa region of Eastern Africa, with its capital and largest city at Asmara. It is bordered by Ethiopia ...
, Ethiopia, Kenya,
Rwanda Rwanda (; rw, u Rwanda ), officially the Republic of Rwanda, is a landlocked country in the Great Rift Valley of Central Africa, where the African Great Lakes region and Southeast Africa converge. Located a few degrees south of the Equator ...
, South Sudan,
Sudan Sudan ( or ; ar, السودان, as-Sūdān, officially the Republic of the Sudan ( ar, جمهورية السودان, link=no, Jumhūriyyat as-Sūdān), is a country in Northeast Africa. It shares borders with the Central African Republic t ...
, Tanzania and Uganda.


Coastal countries

The following countries have a coastline on the Mediterranean Sea: * Northern shore (from west to east): Spain, France, Monaco, Italy, Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, Albania, Greece, Turkey. * Eastern shore (from north to south): Turkey,
Syria Syria ( ar, سُورِيَا or سُورِيَة, translit=Sūriyā), officially the Syrian Arab Republic ( ar, الجمهورية العربية السورية, al-Jumhūrīyah al-ʻArabīyah as-Sūrīyah), is a Western Asian country loc ...
, Lebanon, Israel,
Palestine __NOTOC__ Palestine may refer to: * State of Palestine, a state in Western Asia * Palestine (region), a geographic region in Western Asia * Palestinian territories, territories occupied by Israel since 1967, namely the West Bank (including East ...
, Egypt. * Southern shore (from west to east): Morocco, Algeria, Tunisia, Libya, Egypt. * Island nations: Malta, Cyprus. Several other territories also border the Mediterranean Sea (from west to east): * the
British overseas territory The British Overseas Territories (BOTs), also known as the United Kingdom Overseas Territories (UKOTs), are fourteen dependent territory, territories with a constitutional and historical link with the United Kingdom. They are the last remna ...
of
Gibraltar ) , anthem = " God Save the King" , song = " Gibraltar Anthem" , image_map = Gibraltar location in Europe.svg , map_alt = Location of Gibraltar in Europe , map_caption = United Kingdom shown in pale green , mapsize = , image_map2 = Gib ...
* the Spanish autonomous cities of Ceuta and
Melilla Melilla ( , ; ; rif, Mřič ; ar, مليلية ) is an autonomous city of Spain located in north Africa. It lies on the eastern side of the Cape Three Forks, bordering Morocco and facing the Mediterranean Sea. It has an area of . It was par ...
and nearby islands * the
Sovereign Base Areas Akrotiri and Dhekelia, officially the Sovereign Base Areas of Akrotiri and Dhekelia (SBA),, ''Periochés Kyríarchon Váseon Akrotiríou ke Dekélias''; tr, Ağrotur ve Dikelya İngiliz Egemen Üs Bölgeleri is a British Overseas Territory o ...
on Cyprus * the Palestinian
Gaza Strip The Gaza Strip (;The New Oxford Dictionary of English (1998) – p.761 "Gaza Strip /'gɑːzə/ a strip of territory under the control of the Palestinian National Authority and Hamas, on the SE Mediterranean coast including the town of Gaza.. ...


Exclusive economic zone

Exclusive economic zones in Mediterranean Sea:


Coastline length

The Coastline length is about 46,000 km.


Coastal cities

Major cities (municipalities), with populations larger than 200,000 people, bordering the Mediterranean Sea include: * Algeria:
Algiers Algiers ( ; ar, الجزائر, al-Jazāʾir; ber, Dzayer, script=Latn; french: Alger, ) is the capital and largest city of Algeria. The city's population at the 2008 Census was 2,988,145Census 14 April 2008: Office National des Statistiques ...
, Annaba,
Oran Oran ( ar, وَهران, Wahrān) is a major coastal city located in the north-west of Algeria. It is considered the second most important city of Algeria after the capital Algiers, due to its population and commercial, industrial, and cultural ...
* Egypt: Alexandria, Damietta,
Port Said Port Said ( ar, بورسعيد, Būrsaʿīd, ; grc, Πηλούσιον, Pēlousion) is a city that lies in northeast Egypt extending about along the coast of the Mediterranean Sea, north of the Suez Canal. With an approximate population of 6 ...
* France: Marseille, Toulon, Nice * Greece: Athens, Thessaloniki,
Patras ) , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , demographics1_title2 = , demographics1_info2 = , timezone1 = EET , utc_offset1 = +2 , ...
, Heraklion * Israel:
Ashdod Ashdod ( he, ''ʾašdōḏ''; ar, أسدود or إسدود ''ʾisdūd'' or '' ʾasdūd'' ; Philistine: 𐤀𐤔𐤃𐤃 *''ʾašdūd'') is the sixth-largest city in Israel. Located in the country's Southern District, it lies on the Mediterran ...
, Haifa,
Netanya Netanya (also known as Natanya, he, נְתַנְיָה) is a city in the Northern Central District of Israel, and is the capital of the surrounding Sharon plain. It is north of Tel Aviv, and south of Haifa, between Poleg stream and Wingate I ...
,
Rishon LeZion Rishon LeZion ( he, רִאשׁוֹן לְצִיּוֹן , ''lit.'' First to Zion, Arabic: راشون لتسيون) is a city in Israel, located along the central Israeli coastal plain south of Tel Aviv. It is part of the Gush Dan metropolitan ar ...
, Tel Aviv * Italy:
Bari Bari ( , ; nap, label= Barese, Bare ; lat, Barium) is the capital city of the Metropolitan City of Bari and of the Apulia region, on the Adriatic Sea, southern Italy. It is the second most important economic centre of mainland Southern Italy a ...
,
Catania Catania (, , Sicilian and ) is the second largest municipality in Sicily, after Palermo. Despite its reputation as the second city of the island, Catania is the largest Sicilian conurbation, among the largest in Italy, as evidenced also by ...
, Genoa,
Messina Messina (, also , ) is a harbour city and the capital of the Italian Metropolitan City of Messina. It is the third largest city on the island of Sicily, and the 13th largest city in Italy, with a population of more than 219,000 inhabitants in ...
, Naples,
Palermo Palermo ( , ; scn, Palermu , locally also or ) is a city in southern Italy, the capital (political), capital of both the autonomous area, autonomous region of Sicily and the Metropolitan City of Palermo, the city's surrounding metropolitan ...
, Rome, Taranto, Trieste,
Venice Venice ( ; it, Venezia ; vec, Venesia or ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 small islands that are separated by canals and linked by over 400  ...
* Lebanon: Beirut,
Tripoli Tripoli or Tripolis may refer to: Cities and other geographic units Greece *Tripoli, Greece, the capital of Arcadia, Greece * Tripolis (region of Arcadia), a district in ancient Arcadia, Greece * Tripolis (Larisaia), an ancient Greek city in ...
* Libya:
Benghazi Benghazi () , ; it, Bengasi; tr, Bingazi; ber, Bernîk, script=Latn; also: ''Bengasi'', ''Benghasi'', ''Banghāzī'', ''Binghāzī'', ''Bengazi''; grc, Βερενίκη (''Berenice'') and ''Hesperides''., group=note (''lit. Son of he Ghazi ...
,
Misrata Misrata ( ; also spelled Misurata or Misratah; ar, مصراتة, Miṣrāta ) is a city in the Misrata District in northwestern Libya, situated to the east of Tripoli and west of Benghazi on the Mediterranean coast near Cape Misrata. With ...
,
Tripoli Tripoli or Tripolis may refer to: Cities and other geographic units Greece *Tripoli, Greece, the capital of Arcadia, Greece * Tripolis (region of Arcadia), a district in ancient Arcadia, Greece * Tripolis (Larisaia), an ancient Greek city in ...
, Zawiya, Zliten * Malta: Valletta * Morocco: Tétouan, Tangier * Palestine:
Gaza City Gaza (;''The New Oxford Dictionary of English'' (1998), , p. 761 "Gaza Strip /'gɑːzə/ a strip of territory in Palestine, on the SE Mediterranean coast including the town of Gaza...". ar, غَزَّة ', ), also referred to as Gaza City, i ...
* Spain:
Alicante Alicante ( ca-valencia, Alacant) is a city and municipality in the Valencian Community, Spain. It is the capital of the province of Alicante and a historic Mediterranean port. The population of the city was 337,482 , the second-largest in th ...
, Almería,
Badalona Badalona (, , , ) is a Municipalities of Spain, municipality to the immediate north east of Barcelona in Catalonia, Spain. It is located on the left bank of the Besòs River and on the Mediterranean Sea, in the Barcelona metropolitan area. By popu ...
, Barcelona, Cartagena,
Málaga Málaga (, ) is a municipality of Spain, capital of the Province of Málaga, in the autonomous community of Andalusia. With a population of 578,460 in 2020, it is the second-most populous city in Andalusia after Seville and the sixth most pop ...
,
Palma de Mallorca Palma (; ; also known as ''Palma de Mallorca'', officially between 1983–88, 2006–08, and 2012–16) is the capital and largest city of the Autonomous communities of Spain, autonomous community of the Balearic Islands in Spain. It is situate ...
, Valencia. * Syria:
Latakia , coordinates = , elevation_footnotes = , elevation_m = 11 , elevation_ft = , postal_code_type = , postal_code = , area_code = Country code: 963 City code: 41 , geocode ...
, Tartus * Tunisia: Sfax,
Sousse Sousse or Soussa ( ar, سوسة, ; Berber:''Susa'') is a city in Tunisia, capital of the Sousse Governorate. Located south of the capital Tunis, the city has 271,428 inhabitants (2014). Sousse is in the central-east of the country, on the Gulf ...
, Tunis * Turkey: Alanya, Antalya, Çanakkale, İskenderun, İzmir,
Mersin Mersin (), also known as İçel, is a large city and a port on the Mediterranean Sea, Mediterranean coast of southern Turkey. It is the provincial capital of Mersin Province, Mersin (İçel) Province. It is made up of four municipalities and dis ...


Subdivisions

The International Hydrographic Organization (IHO) divides the Mediterranean into a number of smaller waterbodies, each with their own designation (from west to east): * the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
* the
Alboran Sea The Alboran Sea (from Arabic , ''al-Baḥrān'') is the westernmost portion of the Mediterranean Sea, lying between the Iberian Peninsula and the north of Africa (Spain on the north and Morocco and Algeria on the south). The Strait of Gibraltar, w ...
, between Spain and Morocco * the
Balearic Sea The Balearic Sea ( endotoponym: ''Mar Balear'' in Catalan and Spanish) is a body of water in the Mediterranean Sea between the Balearic Islands and the mainland of Spain. The Ebro River flows into this small sea. Islands and archipelagoes Th ...
, between mainland Spain and its
Balearic Islands The Balearic Islands ( es, Islas Baleares ; or ca, Illes Balears ) are an archipelago in the Balearic Sea, near the eastern coast of the Iberian Peninsula. The archipelago is an autonomous community and a province of Spain; its capital is ...
* the Ligurian Sea between
Corsica Corsica ( , Upper , Southern ; it, Corsica; ; french: Corse ; lij, Còrsega; sc, Còssiga) is an island in the Mediterranean Sea and one of the 18 regions of France. It is the fourth-largest island in the Mediterranean and lies southeast of ...
and Liguria (Italy) * the Tyrrhenian Sea enclosed by Sardinia, Italian peninsula and Sicily * the
Ionian Sea The Ionian Sea ( el, Ιόνιο Πέλαγος, ''Iónio Pélagos'' ; it, Mar Ionio ; al, Deti Jon ) is an elongated bay of the Mediterranean Sea. It is connected to the Adriatic Sea to the north, and is bounded by Southern Italy, including C ...
between Italy, Albania and Greece * the Adriatic Sea between Italy, Slovenia, Croatia, Bosnia and Herzegovina, Montenegro and Albania * the Aegean Sea between Greece and Turkey


Other seas

Some other seas whose names have been in common use from the ancient times, or in the present: * the
Sea of Sardinia The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, ...
, between Sardinia and
Balearic Islands The Balearic Islands ( es, Islas Baleares ; or ca, Illes Balears ) are an archipelago in the Balearic Sea, near the eastern coast of the Iberian Peninsula. The archipelago is an autonomous community and a province of Spain; its capital is ...
, as a part of the
Balearic Sea The Balearic Sea ( endotoponym: ''Mar Balear'' in Catalan and Spanish) is a body of water in the Mediterranean Sea between the Balearic Islands and the mainland of Spain. The Ebro River flows into this small sea. Islands and archipelagoes Th ...
* the
Sea of Sicily The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, ...
between Sicily and Tunisia * the Libyan Sea between Libya and Crete * In the Aegean Sea, ** the
Thracian Sea 250px, Thracian Sea satellite picture The Thracian Sea ( el, Θρακικό Πέλαγος, ''Thrakiko Pelagos''; tr, Trakya Denizi) is the northernmost part of the Aegean Sea. It is bounded by Macedonia and Thrace as well as northwestern Tur ...
in its north ** the Myrtoan Sea between the Cyclades and the
Peloponnese The Peloponnese (), Peloponnesus (; el, Πελοπόννησος, Pelopónnēsos,(), or Morea is a peninsula and geographic regions of Greece, geographic region in southern Greece. It is connected to the central part of the country by the Isthmu ...
** the
Sea of Crete 300px, Map of the Sea of Crete The Sea of Crete (, ''Kritiko Pelagos''), or Cretan Sea, is a sea, part of the Aegean Sea, located in its southern extremity, with a total surface area of . The sea stretches to the north of the island of Crete, eas ...
north of Crete ** the Icarian Sea between Kos and Chios * the Cilician Sea between Turkey and Cyprus * the
Levantine Sea The Levantine Sea (Arabic: بحر الشام, tr, Levanten Denizi, el, Θάλασσα του Λεβάντε) is the easternmost part of the Mediterranean Sea. Geography The Levantine Sea is bordered by Turkey in the north and north-east co ...
at the eastern end of the Mediterranean Many of these smaller seas feature in local myth and folklore and derive their names from such associations.


Other features

In addition to the seas, a number of gulfs and
strait A strait is an oceanic landform connecting two seas or two other large areas of water. The surface water generally flows at the same elevation on both sides and through the strait in either direction. Most commonly, it is a narrow ocean channe ...
s are recognised: * the
Saint George Bay Saint George Bay (french: Golfe de Saint-Georges), also known as the Bay of Beirut, is located on the northern coast of the city of Beirut in Lebanon. The Beirut River empties into the bay. Etymology The bay is named after Saint George, a pop ...
in Beirut, Lebanon * the
Ras Ibn Hani Ras Ibn Hani ( ar, رأس ابن هاني) is a small cape located north of Latakia, Syria on the Mediterranean Sea. It is an important archaeological site as it was occupied almost continuously from the late Bronze Age until Byzantine Empire, B ...
cape in
Latakia , coordinates = , elevation_footnotes = , elevation_m = 11 , elevation_ft = , postal_code_type = , postal_code = , area_code = Country code: 963 City code: 41 , geocode ...
,
Syria Syria ( ar, سُورِيَا or سُورِيَة, translit=Sūriyā), officially the Syrian Arab Republic ( ar, الجمهورية العربية السورية, al-Jumhūrīyah al-ʻArabīyah as-Sūrīyah), is a Western Asian country loc ...
* the Ras al-Bassit cape in northern Syria. * the
Minet el-Beida Minet el-Beida ( ar, المينا البيضا, ''The White Harbor''; or ancient Ma'hadu) is a small bay located north of Latakia, Syria on the Mediterranean Sea.Michael C. Astour, Ma'Hadu, the Harbor of Ugarit, Journal of the Economic and Social ...
("White Harbour") bay near ancient Ugarit,
Syria Syria ( ar, سُورِيَا or سُورِيَة, translit=Sūriyā), officially the Syrian Arab Republic ( ar, الجمهورية العربية السورية, al-Jumhūrīyah al-ʻArabīyah as-Sūrīyah), is a Western Asian country loc ...
* the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
, connects the Atlantic Ocean to the Mediterranean Sea and separates Spain from Morocco * the
Bay of Algeciras The Bay of Gibraltar ( es, Bahía de Algeciras), is a bay at the southern end of the Iberian Peninsula. It is around long by wide, covering an area of some , with a depth of up to in the centre of the bay. It opens to the south into the Strait ...
, at the southern end of the Iberian Peninsula * the
Gulf of Corinth The Gulf of Corinth or the Corinthian Gulf ( el, Κορινθιακός Kόλπος, ''Korinthiakόs Kόlpos'', ) is a deep inlet of the Ionian Sea, separating the Peloponnese from western mainland Greece. It is bounded in the east by the Isth ...
, an enclosed sea between the Ionian Sea and the Corinth Canal * the Pagasetic Gulf, the gulf of Volos, south of the Thermaic Gulf, formed by the Mount Pelion
peninsula A peninsula (; ) is a landform that extends from a mainland and is surrounded by water on most, but not all of its borders. A peninsula is also sometimes defined as a piece of land bordered by water on three of its sides. Peninsulas exist on all ...
* the Saronic Gulf, the gulf of Athens, between the Corinth Canal and the
Mirtoan Sea The Myrtoan Sea (also Mirtoan Sea; el, Mυρτώο Πέλαγος, ''Myrtoo Pelagos'' ) is a subdivision of the Mediterranean Sea that lies between the Cyclades and Peloponnese. It is described as the part of the Aegean Sea south of Euboea, Att ...
* the Thermaic Gulf, the gulf of Thessaloniki, located in the northern Greek region of
Macedonia Macedonia most commonly refers to: * North Macedonia, a country in southeastern Europe, known until 2019 as the Republic of Macedonia * Macedonia (ancient kingdom), a kingdom in Greek antiquity * Macedonia (Greece), a traditional geographic reg ...
* the
Kvarner Gulf The Kvarner Gulf (, or , la, Sinus Flanaticus or ), sometimes also Kvarner Bay, is a bay in the northern Adriatic Sea, located between the Istrian peninsula and the northern Croatian Littoral mainland. The bay is a part of Croatia's internal wat ...
, Croatia * the Gulf of Almeria, southeast of Spain * the Gulf of Lion, south of France * the
Gulf of Valencia The Gulf of Valencia ( ca-valencia, Golf de València, va, es, Golfo de Valencia), is a gulf or inlet of the western Mediterranean Sea, on the eastern coast of Spain. Its limits are the Cap de la Nau headland in the south, while the northern lim ...
, east of Spain * the Strait of Messina, between Sicily and
Calabria , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , demographics1_title2 ...
n peninsula * the Gulf of Genoa, northwestern Italy * the
Gulf of Venice The Gulf of Venice ( it, Golfo di Venezia, sl, Beneški zaliv, hr, Venecijanski zaljev) is an informally recognized gulf of the Adriatic Sea. It lies at the extreme north end of the Adriatic, limited on the southwest by the easternmost point of ...
, northeastern Italy * the Gulf of Trieste, northeastern Italy * the
Gulf of Taranto The Gulf of Taranto ( it, Golfo di Taranto; Tarantino: ; la, Sinus Tarentinus) is a gulf of the Ionian Sea, in Southern Italy. The Gulf of Taranto is almost square, long and wide, making it the largest gulf in Italy, and it is delimited by the ...
, southern Italy * the Gulf of Saint Euphemia, southern Italy, with the international airport nearby * the
Gulf of Salerno The Gulf of Salerno (Italian: ''Golfo di Salerno'') is a gulf of the Tyrrhenian Sea in the coast of the province of Salerno in south-western Italy. The northern part of this coast is the Costiera Amalfitana, which ends at Punta di Campanella an ...
, southwestern Italy * the
Gulf of Gaeta The Gulf of Gaeta is a body of water on the west coast of Italy and part of the Tyrrhenian Sea. It is bounded by Cape Circeo in the north, Ischia and the Gulf of Naples in the south, and the Pontine Islands in the west. The gulf is named for th ...
, southwestern Italy * the
Gulf of Squillace The Gulf of Squillace ( it, Golfo di Squillace; Latin: Scylleticus Sinus or Scyllaceus Sinus; Greek: ) is a body of water, an inlet of the Ionian Sea along the Calabrian coast of Italy. The gulf is part of the Ionian Sea and makes up part of the e ...
, southern Italy * the
Strait of Otranto The Strait of Otranto ( sq, Ngushtica e Otrantos; it, Canale d'Otranto; hr, Otrantska Vrata) connects the Adriatic Sea with the Ionian Sea and separates Italy from Albania. Its width at Punta Palascìa, east of Salento is less than . The st ...
, between Italy and Albania * the
Gulf of Haifa The Bay of Haifa or Haifa Bay ( he, מפרץ חיפה, ''Mifratz Heifa''), formerly Bay of Acre, is a bay along the Mediterranean coast of Northern Israel. Haifa Bay is Israel's only natural harbor on the Mediterranean. ''Haifa Bay'' also ref ...
, northern Israel * the
Gulf of Sidra The Gulf of Sidra ( ar, خليج السدرة, Khalij as-Sidra, also known as the Gulf of Sirte ( ar, خليج سرت, Khalij Surt, is a body of water in the Mediterranean Sea on the northern coast of Libya, named after the oil port of Sidra or ...
, between
Tripolitania Tripolitania ( ar, طرابلس '; ber, Ṭrables, script=Latn; from Vulgar Latin: , from la, Regio Tripolitana, from grc-gre, Τριπολιτάνια), historically known as the Tripoli region, is a historic region and former province o ...
(western Libya) and Cyrenaica (eastern Libya) * the
Strait of Sicily The Strait of Sicily (also known as Sicilian Strait, Sicilian Channel, Channel of Sicily, Sicilian Narrows and Pantelleria Channel; it, Canale di Sicilia or the Stretto di Sicilia; scn, Canali di Sicilia or Strittu di Sicilia, ar, مضيق ص ...
, between Sicily and Tunisia * the Corsica Channel, between
Corsica Corsica ( , Upper , Southern ; it, Corsica; ; french: Corse ; lij, Còrsega; sc, Còssiga) is an island in the Mediterranean Sea and one of the 18 regions of France. It is the fourth-largest island in the Mediterranean and lies southeast of ...
and Italy * the Strait of Bonifacio, between Sardinia and
Corsica Corsica ( , Upper , Southern ; it, Corsica; ; french: Corse ; lij, Còrsega; sc, Còssiga) is an island in the Mediterranean Sea and one of the 18 regions of France. It is the fourth-largest island in the Mediterranean and lies southeast of ...
* the Gulf of Antalya, between west and east shores of Antalya (Turkey) * the Gulf of İskenderun, between İskenderun and Adana (Turkey) * the Gulf of İzmir, in İzmir (Turkey) * the Gulf of Fethiye, in Fethiye (Turkey) * the
Gulf of Kuşadası The Gulf of Kuşadası ( tr, Kuşadası Körfezi) is a small gulf and strait in the Aegean Sea, separating the Greek island of Samos from the mainland of Turkey. Kuşadası is a resort town on Turkey's western Aegean coast, on the Gulf of Kuşada ...
, in İzmir (Turkey) * the Bay of Kotor, in south-western Montenegro and south-eastern Croatia * the
Malta Channel Malta Channel separates the European island of Malta from the southern tip of Sicily. The channel serves as a sea route link to Europe for the Maltese. Virtu Ferries and Ponte Ferries take people and cars from Malta to Italy and vice versa. In W ...
, between Sicily and Malta * the
Gozo Channel The Gozo Channel is short stretch of Mediterranean Sea separating the Maltese island of Gozo from the northern tip of Malta. It is about long and varies in width from at its widest to at its northeastern end. At the centre of the channel are t ...
, between Malta Island and
Gozo Gozo (, ), Maltese: ''Għawdex'' () and in antiquity known as Gaulos ( xpu, 𐤂𐤅𐤋, ; grc, Γαῦλος, Gaúlos), is an island in the Maltese archipelago in the Mediterranean Sea. The island is part of the Republic of Malta. After t ...


Largest islands

The Mediterranean Sea encompasses about 10,000 islands and islets, of which about 250 are permanently inhabited. In the table below are listed the ten largest by size.


Climate

Much of the Mediterranean coast enjoys a hot-summer Mediterranean climate. However, most of its southeastern coast has a hot desert climate, and much of Spain's eastern (Mediterranean) coast has a cold semi-arid climate, while most of Italy's northern (Adriatic) coast has a
humid subtropical climate A humid subtropical climate is a zone of climate characterized by hot and humid summers, and cool to mild winters. These climates normally lie on the southeast side of all continents (except Antarctica), generally between latitudes 25° and 40° ...
. Although they are rare, tropical cyclones occasionally form in the Mediterranean Sea, typically in September–November.


Sea temperature


Oceanography

Being nearly landlocked affects conditions in the Mediterranean Sea: for instance, tides are very limited as a result of the narrow connection with the Atlantic Ocean. The Mediterranean is characterised and immediately recognised by its deep blue colour.
Evaporation Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase. High concentration of the evaporating substance in the surrounding gas significantly slows down evaporation, such as when humidi ...
greatly exceeds precipitation and river runoff in the Mediterranean, a fact that is central to the water circulation within the basin. Evaporation is especially high in its eastern half, causing the water level to decrease and
salinity Salinity () is the saltiness or amount of salt dissolved in a body of water, called saline water (see also soil salinity). It is usually measured in g/L or g/kg (grams of salt per liter/kilogram of water; the latter is dimensionless and equal ...
to increase eastward. The average salinity in the basin is 38
PSU PSU may refer to: Organizations Military *Police Support Unit, a paramilitary wing of the Zimbabwe Republic Police *Port Security Unit, a U.S. Coast Guard expeditionary force protection unit Political parties * Parti Socialiste Unifié (disambig ...
at 5 m depth. The temperature of the water in the deepest part of the Mediterranean Sea is . The net water influx from the Atlantic Ocean is ca. 70,000 m³/s or . Without this Atlantic water, the sea level of the Mediterranean Sea would fall at a rate of about 1 m per year. In
oceanography Oceanography (), also known as oceanology and ocean science, is the scientific study of the oceans. It is an Earth science, which covers a wide range of topics, including ecosystem dynamics; ocean currents, waves, and geophysical fluid dynamic ...
, it is sometimes called the ''Eurafrican Mediterranean Sea'', the ''European Mediterranean Sea'' or the ''African Mediterranean Sea'' to distinguish it from
mediterranean seas The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western Europe, Western and Southern Europe and Anatolia, on the south by North Africa ...
elsewhere.


General circulation

Water circulation The water cycle, also known as the hydrologic cycle or the hydrological cycle, is a biogeochemical cycle that describes the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly cons ...
in the Mediterranean can be attributed to the surface waters entering from the Atlantic through the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
(and also low salinity water entering the Mediterranean from the Black Sea through the Bosphorus). The cool and relatively low-salinity Atlantic water circulates eastwards along the North African coasts. A part of the surface water does not pass the Strait of Sicily, but deviates towards
Corsica Corsica ( , Upper , Southern ; it, Corsica; ; french: Corse ; lij, Còrsega; sc, Còssiga) is an island in the Mediterranean Sea and one of the 18 regions of France. It is the fourth-largest island in the Mediterranean and lies southeast of ...
before exiting the Mediterranean. The surface waters entering the eastern Mediterranean basin circulate along the Libyan and Israeli coasts. Upon reaching the
Levantine Sea The Levantine Sea (Arabic: بحر الشام, tr, Levanten Denizi, el, Θάλασσα του Λεβάντε) is the easternmost part of the Mediterranean Sea. Geography The Levantine Sea is bordered by Turkey in the north and north-east co ...
, the surface waters having warmed and increased its salinity from its initial Atlantic state, is now denser and sinks to form the Levantine Intermediate Waters (LIW). Most of the water found anywhere between 50 and 600 m deep in the Mediterranean originates from the LIW. LIW are formed along the coasts of Turkey and circulate westwards along the Greek and South Italian coasts. LIW are the only waters passing the Sicily Strait westwards. After the Strait of Sicily, the LIW waters circulate along the Italian, French and Spanish coasts before exiting the Mediterranean through the depths of the Strait of Gibraltar. Deep water in the Mediterranean originates from three main areas: the Adriatic Sea, from which most of the deep water in the eastern Mediterranean originates, the Aegean Sea, and the Gulf of Lion. Deep water formation in the Mediterranean is triggered by strong winter convection fueled by intense cold winds like the Bora. When new deep water is formed, the older waters mix with the overlaying intermediate waters and eventually exit the Mediterranean. The residence time of water in the Mediterranean is approximately 100 years, making the Mediterranean especially sensitive to climate change.


Other events affecting water circulation

Being a semi-enclosed basin, the Mediterranean experiences transitory events that can affect the water circulation on short time scales. In the mid-1990s, the Aegean Sea became the main area for deep water formation in the eastern Mediterranean after particularly cold winter conditions. This transitory switch in the origin of deep waters in the eastern Mediterranean was termed Eastern Mediterranean Transient (EMT) and had major consequences on water circulation of the Mediterranean. Another example of a transient event affecting the Mediterranean circulation is the periodic inversion of the North Ionian Gyre, which is an
anticyclonic An anticyclone is a weather phenomenon defined as a large-scale circulation of winds around a central region of high atmospheric pressure, clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere as viewed from abov ...
ocean gyre In oceanography, a gyre () is any large system of circulating ocean currents, particularly those involved with large wind movements. Gyres are caused by the Coriolis effect; planetary vorticity, horizontal friction and vertical friction determine ...
observed in the northern part of the
Ionian Sea The Ionian Sea ( el, Ιόνιο Πέλαγος, ''Iónio Pélagos'' ; it, Mar Ionio ; al, Deti Jon ) is an elongated bay of the Mediterranean Sea. It is connected to the Adriatic Sea to the north, and is bounded by Southern Italy, including C ...
, off the Greek coast. The transition from anticyclonic to cyclonic rotation of this gyre changes the origin of the waters fueling it; when the circulation is anticyclonic (most common), the waters of the gyre originate from the Adriatic Sea. When the circulation is cyclonic, the waters originate from the
Levantine Sea The Levantine Sea (Arabic: بحر الشام, tr, Levanten Denizi, el, Θάλασσα του Λεβάντε) is the easternmost part of the Mediterranean Sea. Geography The Levantine Sea is bordered by Turkey in the north and north-east co ...
. These waters have different physical and chemical characteristics, and the periodic inversion of the North Ionian Gyre (called Bimodal Oscillating System or BiOS) changes the Mediterranean circulation and biogeochemistry around the Adriatic and Levantine regions.


Climate change

Because of the short residence time of waters, the Mediterranean Sea is considered a hot-spot for climate change effects.Giorgi, F. (2006). Climate change hot-spots. Geophysical Research Letters, 33(8) :L08707. 15 Deep water temperatures have increased by between 1959 and 1989. According to climate projections, the Mediterranean Sea could become warmer. The decrease in precipitation over the region could lead to more evaporation ultimately increasing the Mediterranean Sea salinity. Because of the changes in temperature and salinity, the Mediterranean Sea may become more stratified by the end of the 21st century, with notable consequences on water circulation and biogeochemistry. The stratification and warming have already led to the eastern Mediterranean to become a net source of CO2 to the atmosphere notably during summer. This strong summer degassing, combined with the prolonged and pronounced stratification results in the formation of aragonite crystals abiotically in the water column. The cumulative warming at the surface of the Mediterranean has a significant impact on the ecological system. Extreme warming has led to biodiversity loss and presents an existential threat to some habitats while making conditions more hospitable to invasive tropical species.


Biogeochemistry

In spite of its great biodiversity, concentrations of
chlorophyll Chlorophyll (also chlorophyl) is any of several related green pigments found in cyanobacteria and in the chloroplasts of algae and plants. Its name is derived from the Greek words , ("pale green") and , ("leaf"). Chlorophyll allow plants to a ...
and nutrients in the Mediterranean Sea are very low, making it one of the most
oligotrophic An oligotroph is an organism that can live in an environment that offers very low levels of nutrients. They may be contrasted with copiotrophs, which prefer nutritionally rich environments. Oligotrophs are characterized by slow growth, low rates of ...
ocean regions in the world. The Mediterranean Sea is commonly referred to as an LNLC (Low-Nutrient, Low-Chlorophyll) area. The Mediterranean Sea fits the definition of a
desert A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to denudation. About on ...
in which its nutrient contents are low, making it difficult for plants and animals to develop. There are steep gradients in nutrient concentrations, chlorophyll concentrations and primary productivity in the Mediterranean. Nutrient concentrations in the western part of the basin are about double the concentrations in the eastern basin. The
Alboran Sea The Alboran Sea (from Arabic , ''al-Baḥrān'') is the westernmost portion of the Mediterranean Sea, lying between the Iberian Peninsula and the north of Africa (Spain on the north and Morocco and Algeria on the south). The Strait of Gibraltar, w ...
, close to the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
, has a daily primary productivity of about 0.25 g C (grams of carbon) m−2 day−1 whereas the eastern basin has an average daily productivity of 0.16 g C m−2 day−1. For this reason, the eastern part of the Mediterranean Sea is termed "ultraoligotrophic". The productive areas of the Mediterranean Sea are few and small. High (i.e. more than 0.5 grams of Chlorophyll ''a'' per cubic meter) productivity occurs in coastal areas, close to the river mouths which are the primary suppliers of dissolved nutrients. The Gulf of Lion has a relatively high productivity because it is an area of high vertical mixing, bringing nutrients to the surface waters that can be used by
phytoplankton Phytoplankton () are the autotrophic (self-feeding) components of the plankton community and a key part of ocean and freshwater ecosystems. The name comes from the Greek words (), meaning 'plant', and (), meaning 'wanderer' or 'drifter'. Ph ...
to produce Chlorophyll ''a''.Bosc, E., Bricaud, A., and Antoine, D. (2004). Seasonal and interannual variability in algal biomass and primary production in the Mediterranean Sea, as derived from 4 years of SeaWiFS observations : MEDITERRANEAN SEA BIOMASS AND PRODUCTION. Global Biogeochemical Cycles, 18(1). Primary productivity in the Mediterranean is also marked by an intense seasonal variability. In winter, the strong winds and precipitation over the basin generate vertical mixing, bringing nutrients from the deep waters to the surface, where phytoplankton can convert it into
biomass Biomass is plant-based material used as a fuel for heat or electricity production. It can be in the form of wood, wood residues, energy crops, agricultural residues, and waste from industry, farms, and households. Some people use the terms bi ...
. However, in winter, light may be the limiting factor for primary productivity. Between March and April, spring offers the ideal trade-off between light intensity and nutrient concentrations in surface for a spring bloom to occur. In summer, high atmospheric temperatures lead to the warming of the surface waters. The resulting density difference virtually isolates the surface waters from the rest of the water column and nutrient exchanges are limited. As a consequence, primary productivity is very low between June and October. Oceanographic expeditions uncovered a characteristic feature of the Mediterranean Sea biogeochemistry: most of the chlorophyll production does not occur on the surface, but in sub-surface waters between 80 and 200 meters deep. Another key characteristic of the Mediterranean is its high nitrogen-to-phosphorus ratio (N:P). Redfield demonstrated that most of the world's oceans have an average N:P ratio around 16. However, the Mediterranean Sea has an average N:P between 24 and 29, which translates a widespread phosphorus limitation. Because of its low productivity, plankton assemblages in the Mediterranean Sea are dominated by small organisms such as
picophytoplankton Photosynthetic picoplankton or picophytoplankton is the fraction of the phytoplankton performing photosynthesis composed of cells between 0.2 and 2 µm in size ( picoplankton). It is especially important in the central oligotrophic regions of ...
and bacteria.


Geology

The
geologic history Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Eart ...
of the Mediterranean Sea is complex. Underlain by oceanic crust, the sea basin was once thought to be a tectonic remnant of the ancient Tethys Ocean; it is now known to be a structurally younger basin, called the Neotethys, which was first formed by the convergence of the
African African or Africans may refer to: * Anything from or pertaining to the continent of Africa: ** People who are native to Africa, descendants of natives of Africa, or individuals who trace their ancestry to indigenous inhabitants of Africa *** Ethn ...
and Eurasian plates during the Late Triassic and Early Jurassic. Because it is a near-landlocked body of water in a normally dry climate, the Mediterranean is subject to intensive evaporation and the precipitation of evaporites. The Messinian salinity crisis started about six million years ago (mya) when the Mediterranean became landlocked, and then essentially dried up. There are salt deposits accumulated on the bottom of the basin of more than a million cubic kilometres—in some places more than three kilometres thick. Scientists estimate that the sea was last filled about 5.3 million years ago (mya) in less than two years by the Zanclean flood. Water poured in from the Atlantic Ocean through a newly breached gateway now called the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
at an estimated rate of about three orders of magnitude (one thousand times) larger than the current flow of the
Amazon River The Amazon River (, ; es, Río Amazonas, pt, Rio Amazonas) in South America is the largest river by discharge volume of water in the world, and the disputed longest river system in the world in comparison to the Nile. The headwaters of t ...
. The Mediterranean Sea has an average depth of and the deepest recorded point is in the
Calypso Deep Calypso Deep, located in the Hellenic Trench, Ionian Sea 62.6 km south-west of Pylos, Greece, is the deepest part of the Mediterranean Sea, with a maximum depth of , at . Crewed descents The first crewed descent into Calypso Deep was on 27 Sep ...
in the
Ionian Sea The Ionian Sea ( el, Ιόνιο Πέλαγος, ''Iónio Pélagos'' ; it, Mar Ionio ; al, Deti Jon ) is an elongated bay of the Mediterranean Sea. It is connected to the Adriatic Sea to the north, and is bounded by Southern Italy, including C ...
. The coastline extends for . A shallow submarine ridge (the
Strait of Sicily The Strait of Sicily (also known as Sicilian Strait, Sicilian Channel, Channel of Sicily, Sicilian Narrows and Pantelleria Channel; it, Canale di Sicilia or the Stretto di Sicilia; scn, Canali di Sicilia or Strittu di Sicilia, ar, مضيق ص ...
) between the island of Sicily and the coast of Tunisia divides the sea in two main subregions: the Western Mediterranean, with an area of about 850,000 km2 (330,000 mi2); and the Eastern Mediterranean, of about 1.65 million km2 (640,000 mi2). Coastal areas have submarine karst springs or s, which discharge pressurised groundwater into the water from below the surface; the discharge water is usually fresh, and sometimes may be thermal.


Tectonics and paleoenvironmental analysis

The Mediterranean basin and sea system were established by the ancient African-Arabian continent colliding with the Eurasian continent. As Africa-Arabia drifted northward, it closed over the ancient Tethys Ocean which had earlier separated the two supercontinents
Laurasia Laurasia () was the more northern of two large landmasses that formed part of the Pangaea supercontinent from around ( Mya), the other being Gondwana. It separated from Gondwana (beginning in the late Triassic period) during the breakup of Pan ...
and
Gondwana Gondwana () was a large landmass, often referred to as a supercontinent, that formed during the late Neoproterozoic (about 550 million years ago) and began to break up during the Jurassic period (about 180 million years ago). The final stages ...
. At about that time in the middle Jurassic period (roughly 170 million years ago ) a much smaller sea basin, dubbed the Neotethys, was formed shortly before the Tethys Ocean closed at its western (Arabian) end. The broad line of collisions pushed up a very long system of mountains from the Pyrenees in Spain to the Zagros Mountains in Iran in an episode of mountain-building tectonics known as the Alpine orogeny. The Neotethys grew larger during the episodes of collisions (and associated foldings and subductions) that occurred during the
Oligocene The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the ...
and Miocene epochs (34 to 5.33 mya); see animation: Africa-Arabia colliding with Eurasia. Accordingly, the Mediterranean basin consists of several stretched tectonic plates in
subduction Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the ...
which are the foundation of the eastern part of the Mediterranean Sea. Various zones of subduction contain the highest oceanic ridges, east of the
Ionian Sea The Ionian Sea ( el, Ιόνιο Πέλαγος, ''Iónio Pélagos'' ; it, Mar Ionio ; al, Deti Jon ) is an elongated bay of the Mediterranean Sea. It is connected to the Adriatic Sea to the north, and is bounded by Southern Italy, including C ...
and south of the Aegean. The
Central Indian Ridge The Central Indian Ridge (CIR) is a north–south-trending mid-ocean ridge in the western Indian Ocean. Geological setting The morphology of the CIR is characteristic of slow to intermediate ridges. The axial valley is 500–1000 m deep; ...
runs east of the Mediterranean Sea south-east across the in-between of Africa and the
Arabian Peninsula The Arabian Peninsula, (; ar, شِبْهُ الْجَزِيرَةِ الْعَرَبِيَّة, , "Arabian Peninsula" or , , "Island of the Arabs") or Arabia, is a peninsula of Western Asia, situated northeast of Africa on the Arabian Plate ...
into the Indian Ocean.


Messinian salinity crisis

During Mesozoic and
Cenozoic The Cenozoic ( ; ) is Earth's current geological era, representing the last 66million years of Earth's history. It is characterised by the dominance of mammals, birds and flowering plants, a cooling and drying climate, and the current configura ...
times, as the northwest corner of Africa converged on Iberia, it lifted the Betic-Rif
mountain belt A mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have arise ...
s across southern Iberia and northwest Africa. There the development of the intramontane Betic and Rif basins created two roughly parallel marine gateways between the Atlantic Ocean and the Mediterranean Sea. Dubbed the Betic and
Rifian corridors Riffian or Rifian may refer to: Morocco *Riffians, a Berber people *Rifian language, their language *Riff languages, their language family *Rif, a mountainous area of Morocco Italy *Riffian, South Tyrol, a municipality Film *''Rififi ''Rifif ...
, they gradually closed during the middle and late Miocene: perhaps several times. In the late Miocene the closure of the
Betic Corridor The Betic Corridor, or North-Betic Strait, was a strait of water connecting the Mediterranean Sea with the Atlantic Ocean that once separated the Iberian plate from the Eurasian plate through the Betic Cordillera. Its closure approximately 5.96 m ...
triggered the so-called " Messinian salinity crisis" (MSC), characterized by the deposition of a thick evaporitic sequence - with salt deposits up to 2 km thick in the Levantine sea - and by a massive drop in water level in much of the Basin. This event was for long the subject of acute scientific controversy, now much appeased, regarding its sequence, geographic range, processes leading to evaporite facies and salt deposits. The start of the MSC was recently estimated astronomically at 5.96 mya, and it persisted for some 630,000 years until about 5.3 mya; see Animation: Messinian salinity crisis, at right. After the initial drawdown and re-flooding, there followed more episodes—the total number is debated—of sea drawdowns and re-floodings for the duration of the MSC. It ended when the Atlantic Ocean last re-flooded the basin—creating the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
and causing the Zanclean flood—at the end of the Miocene (5.33 mya). Some research has suggested that a desiccation-flooding-desiccation cycle may have repeated several times, which could explain several events of large amounts of salt deposition. Recent studies, however, show that repeated desiccation and re-flooding is unlikely from a geodynamic point of view.


Desiccation and exchanges of flora and fauna

The present-day Atlantic gateway, the
Strait of Gibraltar The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
, originated in the early Pliocene via the Zanclean Flood. As mentioned, there were two earlier gateways: the
Betic Corridor The Betic Corridor, or North-Betic Strait, was a strait of water connecting the Mediterranean Sea with the Atlantic Ocean that once separated the Iberian plate from the Eurasian plate through the Betic Cordillera. Its closure approximately 5.96 m ...
across southern Spain and the
Rifian Corridor Riffian or Rifian may refer to: Morocco *Riffians, a Berber people *Rifian language, their language *Riff languages, their language family *Rif, a mountainous area of Morocco Italy *Riffian, South Tyrol, a municipality Film *''Rififi ''Rifif ...
across northern Morocco. The Betic closed about 6 mya, causing the Messinian salinity crisis (MSC); the Rifian or possibly both gateways closed during the earlier Tortonian times, causing a "
Tortonian salinity crisis The Tortonian is in the geologic time scale an age or stage of the late Miocene that spans the time between 11.608 ± 0.005 Ma and 7.246 ± 0.005 Ma (million years ago). It follows the Serravallian and is followed by the Messinian. The Torton ...
" (from 11.6 to 7.2 mya), long before the MSC and lasting much longer. Both "crises" resulted in broad connections between the mainlands of Africa and Europe, which allowed migrations of flora and fauna—especially large mammals including primates—between the two continents. The
Vallesian crisis The Vallesian age is a period of geologic time (11.6–9.0 Ma) within the Miocene used more specifically with European Land Mammal Ages. It precedes the Turolian age and follows the Astaracian age. The so-called Vallesian Crisis resulted in the e ...
indicates a typical extinction and replacement of mammal species in Europe during Tortonian times following climatic upheaval and overland migrations of new species: see Animation: Messinian salinity crisis (and mammal migrations), at right. The almost complete enclosure of the Mediterranean basin has enabled the oceanic gateways to dominate seawater circulation and the environmental evolution of the sea and basin. Circulation patterns are also affected by several other factors—including climate, bathymetry, and water chemistry and temperature—which are interactive and can induce precipitation of evaporites. Deposits of evaporites accumulated earlier in the nearby
Carpathian foredeep The Carpathian Mountains or Carpathians () are a range of mountains forming an arc across Central Europe. Roughly long, it is the third-longest European mountain range after the Ural Mountains, Urals at and the Scandinavian Mountains at . The ...
during the
Middle Miocene The Middle Miocene is a sub-epoch of the Miocene Epoch made up of two stages: the Langhian and Serravallian stages. The Middle Miocene is preceded by the Early Miocene. The sub-epoch lasted from 15.97 ± 0.05 Ma to 11.608 ± 0.005 Ma (million y ...
, and the adjacent
Red Sea Basin The Red Sea ( ar, البحر الأحمر - بحر القلزم, translit=Modern: al-Baḥr al-ʾAḥmar, Medieval: Baḥr al-Qulzum; or ; Coptic: ⲫⲓⲟⲙ ⲛ̀ϩⲁϩ ''Phiom Enhah'' or ⲫⲓⲟⲙ ⲛ̀ϣⲁⲣⲓ ''Phiom ǹšari''; ...
(during the
Late Miocene The Late Miocene (also known as Upper Miocene) is a sub-epoch of the Miocene epoch (geology), Epoch made up of two faunal stage, stages. The Tortonian and Messinian stages comprise the Late Miocene sub-epoch, which lasted from 11.63 Ma (million ye ...
), and in the whole Mediterranean basin (during the MSC and the
Messinian The Messinian is in the geologic timescale the last age or uppermost stage of the Miocene. It spans the time between 7.246 ± 0.005 Ma and 5.333 ± 0.005 Ma (million years ago). It follows the Tortonian and is followed by the Zanclean, the first ...
age). Many diatomites are found underneath the evaporite deposits, suggesting a connection between their formations. Today, evaporation of surface seawater (output) is more than the supply (input) of fresh water by precipitation and coastal drainage systems, causing the salinity of the Mediterranean to be much higher than that of the Atlantic—so much so that the saltier Mediterranean waters sink below the waters incoming from the Atlantic, causing a two-layer flow across the Strait of Gibraltar: that is, an outflow ''submarine current'' of warm saline Mediterranean water, counterbalanced by an inflow surface current of less saline cold oceanic water from the Atlantic. In the 1920s, Herman Sörgel proposed the building of a hydroelectric dam (the
Atlantropa Atlantropa, also referred to as Panropa, was a gigantic engineering and colonisation idea that was devised by the German architect Herman Sörgel in the 1920s, and promoted by him until his death in 1952. The project was devised to contain sever ...
project) across the Straits, using the inflow current to provide a large amount of hydroelectric energy. The underlying energy grid was also intended to support a political union between Europe and, at least, the Maghreb part of Africa (compare
Eurafrika Eurafrica (a portmanteau of "Europe" and "Africa"), refers to the originally German idea of strategic partnership between Africa and Europe. In the decades before World War II, German supporters of European integration advocated a merger of Afri ...
for the later impact and Desertec for a later project with some parallels in the planned grid).


Shift to a "Mediterranean climate"

The end of the Miocene also marked a change in the climate of the Mediterranean basin. Fossil evidence from that period reveals that the larger basin had a humid subtropical climate with rainfall in the summer supporting
laurel forest Laurel forest, also called laurisilva or laurissilva, is a type of subtropical forest found in areas with high humidity and relatively stable, mild temperatures. The forest is characterized by broadleaf tree species with evergreen, glossy and elo ...
s. The shift to a "Mediterranean climate" occurred largely within the last three million years (the late Pliocene epoch) as summer rainfall decreased. The subtropical laurel forests retreated; and even as they persisted on the islands of Macaronesia off the Atlantic coast of Iberia and North Africa, the present Mediterranean vegetation evolved, dominated by coniferous trees and sclerophyllous trees and shrubs with small, hard, waxy leaves that prevent moisture loss in the dry summers. Much of these forests and shrublands have been altered beyond recognition by thousands of years of human habitation. There are now very few relatively intact natural areas in what was once a heavily wooded region.


Paleoclimate

Because of its latitude and its landlocked position, the Mediterranean is especially sensitive to astronomically induced climatic variations, which are well documented in its sedimentary record. Since the Mediterranean is subject to the deposition of eolian dust from the
Sahara , photo = Sahara real color.jpg , photo_caption = The Sahara taken by Apollo 17 astronauts, 1972 , map = , map_image = , location = , country = , country1 = , ...
during dry periods, whereas riverine detrital input prevails during wet ones, the Mediterranean marine sapropel-bearing sequences provide high-resolution climatic information. These data have been employed in reconstructing astronomically calibrated time scales for the last 9 Ma of the Earth's history, helping to constrain the time of past geomagnetic reversals. Furthermore, the exceptional accuracy of these paleoclimatic records has improved our knowledge of the Earth's orbital variations in the past.


Biodiversity

Unlike the vast multidirectional ocean currents in open oceans within their respective oceanic zones; biodiversity in the Mediterranean Sea is that of a stable one due to the subtle but strong locked nature of currents which affects favourably, even the smallest macroscopic type of volcanic life form. The stable marine ecosystem of the Mediterranean Sea and
sea temperature The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, ...
provides a nourishing environment for life in the deep sea to flourish while assuring a balanced aquatic ecosystem excluded from any external
deep Deep or The Deep may refer to: Places United States * Deep Creek (Appomattox River tributary), Virginia * Deep Creek (Great Salt Lake), Idaho and Utah * Deep Creek (Mahantango Creek tributary), Pennsylvania * Deep Creek (Mojave River tributary), C ...
oceanic factors. It is estimated that there are more than 17,000
marine species Marine life, sea life, or ocean life is the plants, animals and other organisms that live in the salt water of seas or oceans, or the brackish water of coastal estuaries. At a fundamental level, marine life affects the nature of the planet. ...
in the Mediterranean Sea with generally higher marine biodiversity in coastal areas,
continental shelves A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water, known as a shelf sea. Much of these shelves were exposed by drops in sea level during glacial periods. The shelf surrounding an island ...
, and decreases with depth. As a result of the drying of the sea during the Messinian salinity crisis, the marine biota of the Mediterranean are derived primarily from the Atlantic Ocean. The North Atlantic is considerably colder and more nutrient-rich than the Mediterranean, and the marine life of the Mediterranean has had to adapt to its differing conditions in the five million years since the basin was reflooded. The
Alboran Sea The Alboran Sea (from Arabic , ''al-Baḥrān'') is the westernmost portion of the Mediterranean Sea, lying between the Iberian Peninsula and the north of Africa (Spain on the north and Morocco and Algeria on the south). The Strait of Gibraltar, w ...
is a transition zone between the two seas, containing a mix of Mediterranean and Atlantic species. The Alboran Sea has the largest population of
bottlenose dolphin Bottlenose dolphins are aquatic mammals in the genus ''Tursiops.'' They are common, cosmopolitan members of the family Delphinidae, the family of oceanic dolphins. Molecular studies show the genus definitively contains two species: the common ...
s in the Western Mediterranean, is home to the last population of harbour porpoises in the Mediterranean, and is the most important feeding grounds for loggerhead sea turtles in Europe. The Alboran Sea also hosts important commercial fisheries, including sardines and
swordfish Swordfish (''Xiphias gladius''), also known as broadbills in some countries, are large, highly migratory predatory fish characterized by a long, flat, pointed bill. They are a popular sport fish of the billfish category, though elusive. Swordfis ...
. The Mediterranean monk seals live in the Aegean Sea in Greece. In 2003, the World Wildlife Fund raised concerns about the widespread drift net fishing endangering populations of dolphins, turtles, and other marine animals such as the spiny squat lobster. There was a resident population of orcas in the Mediterranean until the 1980s, when they went extinct, probably due to long-term PCB exposure. There are still annual sightings of orca vagrants.


Environmental issues

For 4,000 years, human activity has transformed most parts of Mediterranean Europe, and the "humanisation of the landscape" overlapped with the appearance of the present Mediterranean climate. The image of a simplistic, environmental determinist notion of a Mediterranean paradise on Earth in antiquity, which was destroyed by later civilisations, dates back to at least the 18th century and was for centuries fashionable in archaeological and historical circles. Based on a broad variety of methods, e.g. historical documents, analysis of trade relations, floodplain sediments,
pollen Pollen is a powdery substance produced by seed plants. It consists of pollen grains (highly reduced microgametophytes), which produce male gametes (sperm cells). Pollen grains have a hard coat made of sporopollenin that protects the gametophyt ...
, tree-ring and further archaeometric analyses and population studies, Alfred Thomas Grove's and
Oliver Rackham Oliver Rackham (17 October 1939 – 12 February 2015) was an academic at the University of Cambridge who studied the ecology, management and development of the British countryside, especially trees, woodlands and wood pasture. His books incl ...
's work on "The Nature of Mediterranean Europe" challenges this common wisdom of a Mediterranean Europe as a "Lost Eden", a formerly fertile and forested region, that had been progressively degraded and desertified by human mismanagement. The belief stems more from the failure of the recent landscape to measure up to the imaginary past of the
classics Classics or classical studies is the study of classical antiquity. In the Western world, classics traditionally refers to the study of Classical Greek and Roman literature and their related original languages, Ancient Greek and Latin. Classics ...
as idealised by artists, poets and scientists of the early modern
Enlightenment Enlightenment or enlighten may refer to: Age of Enlightenment * Age of Enlightenment, period in Western intellectual history from the late 17th to late 18th century, centered in France but also encompassing (alphabetically by country or culture): ...
. The historical evolution of climate, vegetation and landscape in southern Europe from prehistoric times to the present is much more complex and underwent various changes. For example, some of the deforestation had already taken place before the Roman age. While in the Roman age large enterprises such as the latifundia took effective care of forests and agriculture, the largest depopulation effects came with the end of the empire. Some assume that the major deforestation took place in modern times—the later usage patterns were also quite different e.g. in southern and northern Italy. Also, the climate has usually been unstable and there is evidence of various ancient and modern "
Little Ice Age The Little Ice Age (LIA) was a period of regional cooling, particularly pronounced in the North Atlantic region. It was not a true ice age of global extent. The term was introduced into scientific literature by François E. Matthes in 1939. Ma ...
s", and plant cover accommodated to various extremes and became resilient to various patterns of human activity. Human activity was therefore not the cause of climate change but followed it. The wide ecological diversity typical of Mediterranean Europe is predominantly based on human behaviour, as it is and has been closely related to human usage patterns. The diversity range was enhanced by the widespread exchange and interaction of the longstanding and highly diverse local agriculture, intense transport and trade relations, and the interaction with settlements, pasture and other land use. The greatest human-induced changes, however, came after World War II, in line with the "1950s syndrome" as rural populations throughout the region abandoned traditional subsistence economies. Grove and Rackham suggest that the locals left the traditional agricultural patterns and instead became scenery-setting agents for tourism. This resulted in more uniform, large-scale formations. Among further current important threats to Mediterranean landscapes are overdevelopment of coastal areas, abandonment of mountains and, as mentioned, the loss of variety via the reduction of traditional agricultural occupations.The Nature of Mediterranean Europe: An Ecological History, by Alfred Thomas Grove, Oliver Rackham, Yale University Press, 2003
review at Yale university pressNature of Mediterranean Europe: An Ecological History (review)
,
Brian M. Fagan Brian Murray Fagan (born 1 August 1936) is a prolific British author of popular archaeology books and a professor emeritus of Anthropology at the University of California, Santa Barbara. Biography Fagan was born in England where he received hi ...
, Journal of Interdisciplinary History, Volume 32, Number 3, Winter 2002, pp. 454–455


Natural hazards

The region has a variety of geological hazards which have closely interacted with human activity and land use patterns. Among others, in the eastern Mediterranean, the Thera eruption, dated to the 17th or 16th century BC, caused a large tsunami that some experts hypothesise devastated the Minoan civilisation on the nearby island of Crete, further leading some to believe that this may have been the catastrophe that inspired the Atlantis legend. Mount Vesuvius is the only active volcano on the European mainland, while others,
Mount Etna Mount Etna, or simply Etna ( it, Etna or ; scn, Muncibbeḍḍu or ; la, Aetna; grc, Αἴτνα and ), is an active stratovolcano on the east coast of Sicily, Italy, in the Metropolitan City of Catania, between the cities of Messina a ...
and
Stromboli Stromboli ( , ; scn, Struògnuli ) is an island in the Tyrrhenian Sea, off the north coast of Sicily, containing Mount Stromboli, one of the four active volcanoes in Italy. It is one of the eight Aeolian Islands, a volcanic arc north of Sici ...
, are on neighbouring islands. The region around Vesuvius including the Phlegraean Fields Caldera west of Naples are quite active and constitute the most densely populated volcanic region in the world where an eruptive event may occur within decades. Vesuvius itself is regarded as quite dangerous due to a tendency towards explosive ( Plinian) eruptions. It is best known for its eruption in AD 79 that led to the burying and destruction of the Roman cities of
Pompeii Pompeii (, ) was an ancient city located in what is now the ''comune'' of Pompei near Naples in the Campania region of Italy. Pompeii, along with Herculaneum and many villas in the surrounding area (e.g. at Boscoreale, Stabiae), was buried ...
and
Herculaneum Herculaneum (; Neapolitan and it, Ercolano) was an ancient town, located in the modern-day ''comune'' of Ercolano, Campania, Italy. Herculaneum was buried under volcanic ash and pumice in the eruption of Mount Vesuvius in AD 79. Like the nea ...
. The large experience of member states and regional authorities has led to exchange on the international level with the cooperation of NGOs, states, regional and municipality authorities and private persons. The
Greek–Turkish earthquake diplomacy The Greek–Turkish earthquake diplomacy ( el, Διπλωματία των σεισμών, Diplomatía ton seismón; ) was initiated after successive earthquakes hit both countries in the summer of 1999 and led to an improvement in Greek–Turki ...
is a quite positive example of natural hazards leading to improved relations between traditional rivals in the region after earthquakes in İzmir and Athens in 1999. The European Union Solidarity Fund (EUSF) was set up to respond to major natural disasters and express European solidarity to disaster-stricken regions within all of Europe. The largest amount of funding requests in the EU relates to
forest fire A wildfire, forest fire, bushfire, wildland fire or rural fire is an unplanned, uncontrolled and unpredictable fire in an area of Combustibility and flammability, combustible vegetation. Depending on the type of vegetation present, a wildfire ...
s, followed by floods and earthquakes. Forest fires, whether man-made or natural, are a frequent and dangerous hazard in the Mediterranean region. Tsunamis are also an often underestimated hazard in the region. For example, the
1908 Messina earthquake The 1908 Messina earthquake (also known as the 1908 Messina and Reggio earthquake) occurred on 28 December in Sicily and Calabria, southern Italy with a moment magnitude of 7.1 and a maximum Mercalli intensity of XI (''Extreme''). The epicen ...
and tsunami took more than 123,000 lives in Sicily and Calabria and were among the most deadly natural disasters in modern Europe.


Invasive species

The opening of the
Suez Canal The Suez Canal ( arz, قَنَاةُ ٱلسُّوَيْسِ, ') is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The long canal is a popular ...
in 1869 created the first salt-water passage between the Mediterranean and the Red Sea. The Red Sea is higher than the
Eastern Mediterranean Eastern Mediterranean is a loose definition of the eastern approximate half, or third, of the Mediterranean Sea, often defined as the countries around the Levantine Sea. It typically embraces all of that sea's coastal zones, referring to communi ...
, so the canal functions as a tidal strait that pours Red Sea water into the Mediterranean. The Bitter Lakes, which are hyper-saline natural lakes that form part of the canal, blocked the migration of Red Sea species into the Mediterranean for many decades, but as the salinity of the lakes gradually equalised with that of the Red Sea, the barrier to migration was removed, and plants and animals from the Red Sea have begun to colonise the Eastern Mediterranean. The Red Sea is generally saltier and more nutrient-poor than the Atlantic, so the Red Sea species have advantages over Atlantic species in the salty and nutrient-poor Eastern Mediterranean. Accordingly, Red Sea species invade the Mediterranean biota, and not vice versa; this phenomenon is known as the Lessepsian migration (after Ferdinand de Lesseps, the French engineer) or Erythrean ("red") invasion. The construction of the Aswan High Dam across the Nile River in the 1960s reduced the inflow of freshwater and nutrient-rich silt from the Nile into the Eastern Mediterranean, making conditions there even more like the Red Sea and worsening the impact of the
invasive species An invasive species otherwise known as an alien is an introduced organism that becomes overpopulated and harms its new environment. Although most introduced species are neutral or beneficial with respect to other species, invasive species ad ...
. Invasive species have become a major component of the Mediterranean ecosystem and have serious impacts on the Mediterranean ecology, endangering many local and endemic Mediterranean species. A first look at some groups of exotic species shows that more than 70% of the non-indigenous decapods and about 63% of the exotic fishes occurring in the Mediterranean are of
Indo-Pacific The Indo-Pacific is a vast biogeographic region of Earth. In a narrow sense, sometimes known as the Indo-West Pacific or Indo-Pacific Asia, it comprises the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the ...
origin, introduced into the Mediterranean through the Suez Canal. This makes the Canal the first pathway of arrival of
alien Alien primarily refers to: * Alien (law), a person in a country who is not a national of that country ** Enemy alien, the above in times of war * Extraterrestrial life, life which does not originate from Earth ** Specifically, intelligent extrater ...
species into the Mediterranean. The impacts of some Lessepsian species have proven to be considerable, mainly in the Levantine basin of the Mediterranean, where they are replacing native species and becoming a familiar sight. According to the International Union for Conservation of Nature definition, as well as Convention on Biological Diversity (CBD) and Ramsar Convention terminologies, they are alien species, as they are non-native (non-indigenous) to the Mediterranean Sea, and they are outside their normal area of distribution which is the Indo-Pacific region. When these species succeed in establishing populations in the Mediterranean Sea, compete with and begin to replace native species they are "Alien Invasive Species", as they are an agent of change and a threat to the native biodiversity. In the context of CBD, "introduction" refers to the movement by human agency, indirect or direct, of an alien species outside of its natural range (past or present). The Suez Canal, being an artificial (man-made) canal, is a human agency. Lessepsian migrants are therefore "introduced" species (indirect, and unintentional). Whatever wording is chosen, they represent a threat to the native Mediterranean biodiversity, because they are non-indigenous to this sea. In recent years, the Egyptian government's announcement of its intentions to deepen and widen the canal have raised concerns from marine biologists, fearing that such an act will only worsen the invasion of Red Sea species into the Mediterranean, and lead to even more species passing through the canal.


Arrival of new tropical Atlantic species

In recent decades, the arrival of exotic species from the tropical Atlantic has become noticeable. Whether this reflects an expansion of the natural area of these species that now enter the Mediterranean through the Gibraltar strait, because of a warming trend of the water caused by global warming; or an extension of the maritime traffic; or is simply the result of a more intense scientific investigation, is still an open question. While not as intense as the "Lessepsian" movement, the process may be of scientific interest and may, therefore, warrant increased levels of monitoring.


Sea-level rise

By 2100 the overall level of the Mediterranean could rise between as a result of the effects of climate change. This could have adverse effects on populations across the Mediterranean: * Rising sea levels will submerge parts of Malta. Rising sea levels will also mean rising salt water levels in Malta's groundwater supply and reduce the availability of drinking water. * A rise in sea level would flood of the
Nile Delta The Nile Delta ( ar, دلتا النيل, or simply , is the delta formed in Lower Egypt where the Nile River spreads out and drains into the Mediterranean Sea. It is one of the world's largest river deltas—from Alexandria in the west to Po ...
, displacing over 500,000
Egyptians Egyptians ( arz, المَصرِيُون, translit=al-Maṣriyyūn, ; arz, المَصرِيِين, translit=al-Maṣriyyīn, ; cop, ⲣⲉⲙⲛ̀ⲭⲏⲙⲓ, remenkhēmi) are an ethnic group native to the Nile, Nile Valley in Egypt. Egyptian ...
. * Cyprus wetlands are also in danger of being destroyed by the rising temperatures and sea levels. Coastal ecosystems also appear to be threatened by sea level rise, especially enclosed seas such as the
Baltic Baltic may refer to: Peoples and languages * Baltic languages, a subfamily of Indo-European languages, including Lithuanian, Latvian and extinct Old Prussian *Balts (or Baltic peoples), ethnic groups speaking the Baltic languages and/or originati ...
, the Mediterranean and the Black Sea. These seas have only small and primarily east–west movement corridors, which may restrict northward displacement of organisms in these areas. Sea level rise for the next century (2100) could be between and and temperature shifts of a mere 0.05–0.1 °C in the deep sea are sufficient to induce significant changes in species richness and functional diversity.


Pollution

Pollution in this region has been extremely high in recent years. The United Nations Environment Programme has estimated that of
sewage Sewage (or domestic sewage, domestic wastewater, municipal wastewater) is a type of wastewater that is produced by a community of people. It is typically transported through a sewer system. Sewage consists of wastewater discharged from residenc ...
, of mineral oil, of mercury, of lead and of phosphates are dumped into the Mediterranean each year. The Barcelona Convention aims to 'reduce pollution in the Mediterranean Sea and protect and improve the marine environment in the area, thereby contributing to its sustainable development.' Many marine species have been almost wiped out because of the sea's pollution. One of them is the Mediterranean monk seal which is considered to be among the world's most endangered marine mammals. The Mediterranean is also plagued by
marine debris Marine debris, also known as marine litter, is human-created waste that has deliberately or accidentally been released in a sea or ocean. Floating oceanic debris tends to accumulate at the center of gyres and on coastlines, frequently washing ...
. A 1994 study of the seabed using
trawl net Trawling is a method of fishing that involves pulling a fishing net through the water behind one or more boats. The net used for trawling is called a trawl. This principle requires netting bags which are towed through water to catch different speci ...
s around the coasts of Spain, France and Italy reported a particularly high mean concentration of debris; an average of 1,935 items per km2.


Plastic pollution

Plastic debris Marine debris, also known as marine litter, is human-created waste that has deliberately or accidentally been released in a sea or ocean. Floating oceanic debris tends to accumulate at the center of gyres and on coastlines, frequently washing ...
accounted for 76% of debris in a 1994 study, of which 94% was
plastic bag A plastic bag, poly bag, or pouch is a type of container made of thin, flexible, plastic film, nonwoven fabric, or plastic textile. Plastic bags are used for containing and transporting goods such as foods, produce, powders, ice, magazines, c ...
s.


Bottom trawling


Shipping

Some of the world's busiest shipping routes are in the Mediterranean Sea. In particular, the Maritime Silk Road from Asia and Africa leads through the Suez Canal directly into the Mediterranean Sea to its deep-water ports in Piraeus, Trieste, Genoa,
Marseilles Marseille ( , , ; also spelled in English as Marseilles; oc, Marselha ) is the prefecture of the French department of Bouches-du-Rhône and capital of the Provence-Alpes-Côte d'Azur region. Situated in the camargue region of southern Franc ...
and Barcelona. It is estimated that approximately 220,000
merchant vessel A merchant ship, merchant vessel, trading vessel, or merchantman is a watercraft that transports cargo or carries passengers for hire. This is in contrast to pleasure craft, which are used for personal recreation, and naval ships, which are us ...
s of more than 100 tonnes cross the Mediterranean Sea each year—about one-third of the world's total merchant shipping. These ships often carry hazardous cargo, which if lost would result in severe damage to the marine environment. The discharge of chemical tank washings and oily wastes also represent a significant source of marine pollution. The Mediterranean Sea constitutes 0.7% of the global water surface and yet receives 17% of global marine oil pollution. It is estimated that every year between and of crude oil are deliberately released into the sea from shipping activities. Approximately of oil are transported annually in the Mediterranean Sea (more than 20% of the world total), with around 250–300 oil tankers crossing the sea every day. An important destination is the
Port of Trieste The Free Port of Trieste is a port in the Adriatic Sea in Trieste, Italy. It's the most important commercial port of Italy with a trade volume of 62 million tonnes. It is subdivided into 5 different Free Areas, 3 of which have been allotted to ...
, the starting point of the
Transalpine Pipeline The Transalpine Pipeline (TAL) is a crude oil pipeline, which connects Italy, Austria and Germany. History The feasibility study of the pipeline was carried out by Bechtel in 1963. The pipeline was commissioned in 1967. This time, the constru ...
, which covers 40% of Germany's oil demand (100% of the federal states of Bavaria and Baden-Württemberg), 90% of Austria and 50% of the Czech Republic. Accidental
oil spill An oil spill is the release of a liquid petroleum hydrocarbon into the environment, especially the marine ecosystem, due to human activity, and is a form of pollution. The term is usually given to marine oil spills, where oil is released into th ...
s happen frequently with an average of 10 spills per year. A major oil spill could occur at any time in any part of the Mediterranean.


Tourism

The coast of the Mediterranean has been used for tourism since ancient times, as the Roman villa buildings on the Amalfi Coast or in Barcola show. From the end of the 19th century, in particular, the beaches became places of longing for many Europeans and travellers. From then on, and especially after World War II, mass tourism to the Mediterranean began with all its advantages and disadvantages. While initially, the journey was by train and later by bus or car, today the plane is increasingly used. Tourism is today one of the most important sources of income for many Mediterranean countries, despite the man-made geopolitical conflicts in the region. The countries have tried to extinguish rising man-made chaotic zones that might affect the region's economies and societies in neighbouring coastal countries, and shipping routes. Naval and rescue components in the Mediterranean Sea are considered to be among the best due to the rapid cooperation between various naval fleets. Unlike the vast open oceans, the sea's closed position facilitates effective naval and rescue missions, considered the safest and regardless of any man-made or
natural disaster A natural disaster is "the negative impact following an actual occurrence of natural hazard in the event that it significantly harms a community". A natural disaster can cause loss of life or damage property, and typically leaves some econ ...
. Tourism is a source of income for small coastal communities, including islands, independent of urban centres. However, tourism has also played a major role in the degradation of the coastal and
marine environment Marine habitats are habitats that support marine life. Marine life depends in some way on the saltwater that is in the sea (the term ''marine'' comes from the Latin ''mare'', meaning sea or ocean). A habitat is an ecological or environmental ...
. Rapid development has been encouraged by Mediterranean governments to support the large numbers of tourists visiting the region, but this has caused serious disturbance to marine habitats by erosion and pollution in many places along the Mediterranean coasts. Tourism often concentrates in areas of high natural wealth, causing a serious threat to the habitats of endangered species such as sea turtles and
monk seal Monk seals are earless seals of the tribe Monachini. They are the only earless seals found in tropical climates. The two genera of monk seals, ''Monachus'' and ''Neomonachus'', comprise three species: the Mediterranean monk seal, ''Monachus mona ...
s. Reductions in natural wealth may reduce the incentive for tourists to visit.


Overfishing

Fish stock levels in the Mediterranean Sea are alarmingly low. The European Environment Agency says that more than 65% of all fish stocks in the region are outside safe biological limits and the United Nations Food and Agriculture Organisation, that some of the most important fisheries—such as albacore and bluefin tuna, hake, marlin,
swordfish Swordfish (''Xiphias gladius''), also known as broadbills in some countries, are large, highly migratory predatory fish characterized by a long, flat, pointed bill. They are a popular sport fish of the billfish category, though elusive. Swordfis ...
, red mullet and
sea bream The Sparidae are a family of fish in the order Perciformes, commonly called sea breams and porgies. The sheepshead, scup, and red seabream are species in this family. Most sparids are deep-bodied compressed fish with a small mouth separated by a ...
—are threatened. There are clear indications that catch size and quality have declined, often dramatically, and in many areas, larger and longer-lived species have disappeared entirely from commercial catches. Large open-water fish like tuna have been a shared fisheries resource for thousands of years but the stocks are now dangerously low. In 1999,
Greenpeace Greenpeace is an independent global campaigning network, founded in Canada in 1971 by Irving Stowe and Dorothy Stowe, immigrant environmental activists from the United States. Greenpeace states its goal is to "ensure the ability of the Earth t ...
published a report revealing that the amount of bluefin tuna in the Mediterranean had decreased by over 80% in the previous 20 years and government scientists warn that without immediate action the stock will collapse.


Marine heatwaves

A study showed that climate change-related exceptional marine heatwaves in the Mediterranean Sea during 2015–2019 resulted in widespread mass sealife die-offs in five consecutive years.


Gallery

File:Coast of Alexandria, A view From Bibliotheca Alexandrina, Egypt.jpg, Coast of Alexandria, view From Bibliotheca Alexandrina, Egypt File:Hammametgolf.jpg, Beach of Hammamet, Tunisia File:Plage-de-la-courtade.jpg, The beach of la Courtade in the
Îles d'Hyères The Îles d'Hyères (), also known as Îles d'Or (), are a group of four Mediterranean islands off Hyères in the Var department of Southeastern France. Islands With a combined area of , the Îles d'Hyères consist of *Porquerolles – , ...
, France File:Chia beach, Sardinia, Italy.jpg, Sardinia's south coast, Italy File:Malta - Birzebbuga - Triq il-Bajja s-Sabiha + Pretty Bay + Gnien Mons. Guzeppi Minuti 03 ies.jpg, Pretty Bay in Birżebbuġa, Malta File:Piran Stadtpanorama.jpg, Panoramic view of Piran, Slovenia File:Cavtat Croatia 2008-10-07.JPG, Panoramic view of
Cavtat Cavtat (, it, Ragusa Vecchia, lit=Old Ragusa) is a village in the Dubrovnik-Neretva County of Croatia. It is on the Adriatic Sea coast south of Dubrovnik and is the centre of the Konavle municipality. History Antiquity The original city was ...
, Croatia File:Neum02451.JPG, View of Neum, Bosnia and Herzegovina File:svetistefan1756.JPG, A view of Sveti Stefan, Montenegro File:Ksamill-1.jpg,
Ksamil Islands The Islets of Ksamil (), consist of four rocky islets located in the direct proximity to the Ionian Sea in Southern Albania. The village of Ksamil, after whom the islets are named, is located to the east of the islets. Furthermore, the islands ar ...
, Albania File:Panagiotis wreck.jpg,
Navagio Navagio Beach (Greek: Παραλία Ναυάγιο, ), or Shipwreck Beach, is an exposed cove, sometimes referred to as "Smugglers Cove", on the coast of Zakynthos, in the Ionian Islands of Greece. Navagio Beach was originally known as Agios ...
, Greece File:Blue_Lagoon_-_2014.10_-_panoramio.jpg, Ölüdeniz, Turquoise Coast, Turkey File:Petra tou romiou beach.jpg, Paphos, Cyprus File:Burjeslam.jpg, Burj Islam Beach,
Latakia , coordinates = , elevation_footnotes = , elevation_m = 11 , elevation_ft = , postal_code_type = , postal_code = , area_code = Country code: 963 City code: 41 , geocode ...
, Syria File:BeirutRaouche1.jpg, A view of Raouché off the coast of Beirut, Lebanon File:Bat Galim neighborhood and Haifa Bay.jpg, A view of Haifa, Israel File:ForbysIbizaTown 02.jpg, Old city of Ibiza Town, Spain File:Les Aiguades.jpg, Les Aiguades near Béjaïa, Algeria File:EL Jebha1.jpg, El Jebha, a port town in Morocco File:Gibraltar-Europa-Point-LH-from-the-sea.jpg, Europa Point, Gibraltar File:Monaco City 001.jpg, Panoramic view of La Condamine, Monaco File:شاطئ دير البلح horizon adjusted.jpg, Sunset at the Deir al-Balah beach, Gaza Strip


See also

* * * , the site of the Mediterranean cultures * * * * * * * * * * * * * * * * * Names of the Mediterranean Sea * – Early cartographer of the Mediterranean * * – also known as the Japanese Mediterranean Sea * *


Notes


References


External links


Mediterranean Sea Microorganisms: 180+ images of Foraminifera

Eastern Mediterranean Sea Long Term Ecological Research Station
{{Authority control Mediterranean Sea, European seas Geography of Central Europe Geography of North Africa Geography of Southern Europe Geography of Western Asia Geography of Western Europe Marginal seas of the Atlantic Ocean Marine ecoregions Natural history of Europe Articles containing video clips Seas of Albania Seas of Africa Seas of Asia Seas of France Seas of Greece Seas of Italy Seas of Spain Seas of Turkey