body of water A body of water or waterbody (often spelled water body) is any significant accumulation of water on the surface of Earth or another planet. The term most often refers to oceans, seas, and lakes, but it includes smaller pools of water such a ...

endorheic basin An endorheic basin (; also spelled endoreic basin or endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but drainage converges instead into lakes ...

Caucasus The Caucasus () or Caucasia (), is a region between the Black Sea and the Caspian Sea, mainly comprising Armenia, Azerbaijan, Georgia (country), Georgia, and parts of Southern Russia. The Caucasus Mountains, including the Greater Caucasus range ...

Central Asia Central Asia, also known as Middle Asia, is a subregion, region of Asia that stretches from the Caspian Sea in the west to western China and Mongolia in the east, and from Afghanistan and Iran in the south to Russia in the north. It includes t ...

Iranian Plateau The Iranian plateau or Persian plateau is a geological feature in Western Asia, Central Asia, and South Asia. It comprises part of the Eurasian Plate and is wedged between the Arabian Plate and the Indian Plate; situated between the Zagros ...

seawater Seawater, or salt water, is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5% (35 g/L, 35 ppt, 600 mM). This means that every kilogram (roughly one liter by volume) of seawater has appr ...

Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...

Russia Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eig ...

Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of t ...

Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...

sea level Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardise ...

Volga The Volga (; russian: Во́лга, a=Ru-Волга.ogg, p=ˈvoɫɡə) is the longest river in Europe. Situated in Russia, it flows through Central Russia to Southern Russia and into the Caspian Sea. The Volga has a length of , and a catchm ...

caviar Caviar (also known as caviare; from fa, خاویار, khâvyâr, egg-bearing) is a food consisting of salt-cured roe of the family Acipenseridae. Caviar is considered a delicacy and is eaten as a garnish or a spread. Traditionally, the te ...

Albania Albania ( ; sq, Shqipëri or ), or , also or . officially the Republic of Albania ( sq, Republika e Shqipërisë), is a country in Southeastern Europe. It is located on the Adriatic and Ionian Seas within the Mediterranean Sea and shares ...

Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...

Khwarezmia Khwarazm (; Old Persian: ''Hwârazmiya''; fa, خوارزم, ''Xwârazm'' or ''Xârazm'') or Chorasmia () is a large oasis region on the Amu Darya river delta in western Central Asia, bordered on the north by the (former) Aral Sea, on the ea ...

classical antiquity Classical antiquity (also the classical era, classical period or classical age) is the period of cultural history between the 8th century BC and the 5th century AD centred on the Mediterranean Sea, comprising the interlocking civilizations of ...

Hyrcania Hyrcania () ( el, ''Hyrkania'', Old Persian: 𐎺𐎼𐎣𐎠𐎴 ''Varkâna'',Lendering (1996) Middle Persian: 𐭢𐭥𐭫𐭢𐭠𐭭 ''Gurgān'', Akkadian: ''Urqananu'') is a historical region composed of the land south-east of the Caspian ...

Bachu Maralbexi County (Maralbeshi, Maralbishi, transliterated from ; ), Bachu County (), and ) the former long Chinese name as well, is located in the southwest of the Xinjiang Uyghur Autonomous Region of the People's Republic of China and is under th ...

Kumyks , image = Abdul-Wahab son of Mustafa — a prominent Kumyk architect of the 19th century. , population = near 600,000 , region1 = , pop1 = 503,060 , ref1 = , region2 = , pop2 ...

Tarki Tarki ( kum, Таргъу, Tarğu; russian: Тарки́) formerly also spelled Tarkou and also known as Tarku, is an urban locality (an urban-type settlement) under the administrative jurisdiction of Sovetsky City District of the City of ...

Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...

Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...

Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of t ...

Russia Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eig ...

Armenia Armenia (), , group=pron officially the Republic of Armenia,, is a landlocked country in the Armenian Highlands of Western Asia.The UNbr>classification of world regions places Armenia in Western Asia; the CIA World Factbook , , and ' ...

Georgia Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ...

Turkey Turkey ( tr, Türkiye ), officially the Republic of Türkiye ( tr, Türkiye Cumhuriyeti, links=no ), is a transcontinental country located mainly on the Anatolian Peninsula in Western Asia, with a small portion on the Balkan Peninsula in ...

Uzbekistan Uzbekistan (, ; uz, Ozbekiston, italic=yes / , ; russian: Узбекистан), officially the Republic of Uzbekistan ( uz, Ozbekiston Respublikasi, italic=yes / ; russian: Республика Узбекистан), is a doubly landlocked co ...

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Rom ...

granite Granite () is a coarse-grained ( phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies under ...

tectonic uplift Tectonic uplift is the geologic uplift of Earth's surface that is attributed to plate tectonics. While isostatic response is important, an increase in the mean elevation of a region can only occur in response to tectonic processes of crustal th ...

sea level Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardise ...

Pliocene The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58 During warm and dry climatic periods, the landlocked sea almost dried up, depositing evaporitic sediments like halite that were covered by wind-blown deposits and were sealed off as an

evaporite An evaporite () is a water- soluble sedimentary mineral deposit that results from concentration and crystallization by evaporation from an aqueous solution. There are two types of evaporite deposits: marine, which can also be described as ocean ...

sink A sink is a bowl-shaped plumbing fixture for washing hands, dishwashing, and other purposes. Sinks have a tap (faucet) that supply hot and cold water and may include a spray feature to be used for faster rinsing. They also include a drain t ...

when cool, wet climates refilled the basin. (Comparable evaporite beds underlie the

Mediterranean 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 ...

.) Due to the current inflow of fresh water in the north, the Caspian Sea water is almost fresh in its northern portions, getting more brackish toward the south. It is most saline on the Iranian shore, where the catchment basin contributes little flow. Currently, the mean salinity of the Caspian is one third that of Earth's oceans. The Garabogazköl

embayment A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, a lake, or another bay. A large bay is usually called a gulf, sea, sound, or bight. A cove is a small, circular bay with a na ...

, which dried up when water flow from the main body of the Caspian was blocked in the 1980s but has since been restored, routinely exceeds oceanic salinity by a factor of 10.

Geography

The Caspian Sea is the largest inland body of water in the world by area and accounts for 40 to 44% of the total

lacustrine A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much larger ...

waters of the world, and covers an area larger than

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

. The coastlines of the Caspian are shared by

Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of t ...

, Iran,

Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...

, Russia, and Turkmenistan. The Caspian is divided into three distinct physical regions: the Northern, Middle, and Southern Caspian. The Northern–Middle boundary is the Mangyshlak Threshold, which runs through Chechen Island and Cape Tiub-Karagan. The Middle–Southern boundary is the Apsheron Threshold, a sill of tectonic origin between the Eurasian continent and an oceanic remnant, that runs through Zhiloi Island and Cape Kuuli. The Garabogazköl Bay is the saline eastern inlet of the Caspian, which is part of Turkmenistan and at times has been a lake in its own right due to the isthmus that cuts it off from the Caspian. Differences between the three regions are dramatic. The Northern Caspian only includes the Caspian shelf, and is very shallow; it accounts for less than 1% of the total water volume with an average depth of only . The sea noticeably drops off towards the Middle Caspian, where the average depth is . The Southern Caspian is the deepest, with oceanic depths of over , greatly exceeding the depth of other regional seas, such as the

Persian Gulf The Persian Gulf ( fa, خلیج فارس, translit=xalij-e fârs, lit=Gulf of Fars, ), sometimes called the ( ar, اَلْخَلِيْجُ ٱلْعَرَبِيُّ, Al-Khalīj al-ˁArabī), is a mediterranean sea in Western Asia. The bod ...

. The Middle and Southern Caspian account for 33% and 66% of the total water volume, respectively. The northern portion of the Caspian Sea typically freezes in the winter, and in the coldest winters ice forms in the south as well. Over 130 rivers provide inflow to the Caspian, the Volga River being the largest. A second affluent, the Ural River, flows in from the north, and the Kura River from the west. In the past, the Amu Darya (Oxus) of Central Asia in the east often changed course to empty into the Caspian through a now-desiccated riverbed called the Uzboy River, as did the Syr Darya farther north. The Caspian has several small islands, primarily located in the north with a collective land area of roughly . Adjacent to the North Caspian is the

Caspian Depression The Caspian Depression ( kk, Каспий маңы ойпаты, ''Kaspıı mańy oıpaty''; rus, Прикаспи́йская ни́зменность, p=prʲɪkɐˈspʲijskəjə ˈnʲizmʲɪnnəsʲtʲ, Caspian Lowland) or Pricaspian/Peri-Casp ...

, a low-lying region below

sea level Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardise ...

. The

Central Asia Central Asia, also known as Middle Asia, is a subregion, region of Asia that stretches from the Caspian Sea in the west to western China and Mongolia in the east, and from Afghanistan and Iran in the south to Russia in the north. It includes t ...

n steppes stretch across the northeast coast, while the Caucasus mountains hug the western shore. The biomes to both the north and east are characterized by cold, continental deserts. Conversely, the climate to the southwest and south are generally warm with uneven elevation due to a mix of highlands and

mountain range 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; the drastic changes in climate alongside the Caspian have led to a great deal of

biodiversity Biodiversity or biological diversity is the variety and variability of life on Earth. Biodiversity is a measure of variation at the genetic (''genetic variability''), species (''species diversity''), and ecosystem (''ecosystem diversity'') l ...

in the region. The Caspian Sea has numerous islands near the coasts, but none in the deeper parts of the sea.

Ogurja Ada , image_name = Ogurchinsky_caspian.jpg , image_caption = 19th-century Russian map of Ogurchinskiy Island , image_size = , map_image = Caspian5OGU.png , map_caption = Location of Ogurja Ada in the Caspian Sea , location = Ca ...

is the largest island. The island is long, with

gazelle A gazelle is one of many antelope species in the genus ''Gazella'' . This article also deals with the seven species included in two further genera, '' Eudorcas'' and '' Nanger'', which were formerly considered subgenera of ''Gazella''. A third ...

s roaming freely on it. In the North Caspian, the majority of the islands are small and uninhabited, like the Tyuleniy Archipelago, an Important Bird Area (IBA).

Climate

The climate of the Caspian Sea is variable, with the

cold desert climate The desert climate or arid climate (in the Köppen climate classification ''BWh'' and ''BWk''), is a dry climate sub-type in which there is a severe excess of evaporation over precipitation. The typically bald, rocky, or sandy surfaces in desert ...

(BWk), cold semi-arid climate (BSk), and

humid continental climate A humid continental climate is a climatic region defined by Russo-German climatologist Wladimir Köppen in 1900, typified by four distinct seasons and large seasonal temperature differences, with warm to hot (and often humid) summers and freezing ...

(Dsa, Dfa) being present in the northern portions of the Caspian Sea, while the

Mediterranean climate A Mediterranean climate (also called a dry summer temperate climate ''Cs'') is a temperate climate sub-type, generally characterized by warm, dry summers and mild, fairly wet winters; these weather conditions are typically experienced in the ...

(Csa) and humid subtropical climate (Cfa) are present in the southern portions of the Caspian Sea.

Hydrology

The Caspian has characteristics common to both seas and lakes. It is often listed as the world's largest lake, although it is not freshwater: the 1.2% salinity classes it with

brackish water Brackish water, sometimes termed brack water, is water occurring in a natural environment that has more salinity than freshwater, but not as much as seawater. It may result from mixing seawater (salt water) and fresh water together, as in estuari ...

bodies. It contains about 3.5 times as much water, by volume, as all five of North America's

Great Lakes The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes in the mid-east region of North America that connect to the Atlantic Ocean via the Saint Lawrence River. There are five lak ...

combined. The Volga River (about 80% of the inflow) and the Ural River discharge into the Caspian Sea, but it has no natural outflow other than by evaporation. Thus the Caspian

ecosystem An ecosystem (or ecological system) consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows. Energy enters the syste ...

is a

closed basin An endorheic basin (; also spelled endoreic basin or endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but drainage converges instead into lakes ...

, with its own sea level history that is independent of the eustatic level of the world's oceans. The sea level of the Caspian has fallen and risen, often rapidly, many times over the centuries. Some Russian historians claim that a

medieval In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire ...

rising of the Caspian, perhaps caused by the Amu Darya changing its inflow to the Caspian from the 13th century to the 16th century, caused the coastal towns of

Khazaria The Khazars ; he, כּוּזָרִים, Kūzārīm; la, Gazari, or ; zh, 突厥曷薩 ; 突厥可薩 ''Tūjué Kěsà'', () were a semi-nomadic Turkic people that in the late 6th-century CE established a major commercial empire coverin ...

, such as

Atil Atil (also Itil) , was the capital of the Khazar Khaganate from the middle of the 8th century until the end of the 10th century. Known to have been situated on the Silk Road in the vicinity of the Caspian Sea, its precise location has long bee ...

, to flood. In 2004, the water level was below

sea level Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardise ...

. Over the centuries, Caspian Sea levels have changed in synchrony with the estimated discharge of the Volga, which in turn depends on rainfall levels in its vast catchment basin. Precipitation is related to variations in the amount of North Atlantic depressions that reach the interior, and they in turn are affected by cycles of the North Atlantic oscillation. Thus levels in the Caspian Sea relate to atmospheric conditions in the North Atlantic, thousands of kilometres to the northwest. The last short-term sea-level cycle started with a sea-level fall of from 1929 to 1977, followed by a rise of from 1977 until 1995. Since then smaller oscillations have taken place. A study by the Azerbaijan Academy of Sciences estimated that the level of the sea was dropping by more than six centimetres per year due to increased evaporation due to rising temperatures caused by

climate change In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to ...

.

Environmental degradation

The Volga River, the longest river in Europe, drains 20% of the European land area and is the source of 80% of the Caspian's inflow. Heavy development in its lower reaches has caused numerous unregulated releases of chemical and biological pollutants. The

UN Environment Programme The United Nations Environment Programme (UNEP) is responsible for coordinating responses to environmental issues within the United Nations system. It was established by Maurice Strong, its first director, after the United Nations Conference on th ...

warns that the Caspian "suffers from an enormous burden of pollution from oil extraction and refining, offshore oil fields, radioactive wastes from nuclear power plants and huge volumes of untreated sewage and industrial waste introduced mainly by the Volga River". The magnitude of fossil fuel extraction and transport activity in the Caspian also poses a risk to the environment. The island of Vulf off Baku, for example, has suffered ecological damage as a result of the petrochemical industry; this has significantly decreased the number of species of marine birds in the area. Existing and planned oil and gas pipelines under the sea further increase the potential threat to the environment. The high concentration of mud volcanoes under the Caspian Sea were thought to be the cause of a fire that broke out 75 kilometers from Baku on July 5, 2021. The State oil company of Azerbaijan SOCAR said preliminary information indicated it was a mud volcano which spewed both mud and flammable gas. It is calculated that during the 21st century, the water level of the Caspian Sea will decrease by 9–18 m (30–60 ft) due to the acceleration of evaporation due to

global warming In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to E ...

and the process of desertification. On October 23, 2021, Kazakhstan President Kassym-Jomart Tokayev signed the Protocol for the Protection of the Caspian Sea against Pollution from Land-based Sources in order to ensure better protection for the biodiversity of the Caspian Sea.

Flora and fauna

Flora

The rising level of the Caspian Sea between 1994 and 1996 reduced the number of habitats for rare species of aquatic vegetation. This has been attributed to a general lack of seeding material in newly formed coastal

lagoon A lagoon is a shallow body of water separated from a larger body of water by a narrow landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses. Lagoons are commonly divided into ''coastal lagoons'' (or ''barrier lagoons'') ...

s and water bodies. Many rare and endemic plant species of Russia are associated with the tidal areas of the

Volga delta The Volga Delta is the largest river delta in Europe, and occurs where Europe's largest river system, the Volga River, drains into the Caspian Sea in Russia's Astrakhan Oblast, north-east of the republic of Kalmykia. The delta is located in the ...

and

riparian forest A riparian forest or riparian woodland is a forested or wooded area of land adjacent to a body of water such as a river, stream, pond, lake, marshland, estuary, canal Canals or artificial waterways are waterways or engineered chann ...

s of the

Samur River The Samur ( rut, Самыр; ; russian: Самур; az, Samurçay) is a river in Russia's Dagestan Republic, also partially flowing through Azerbaijan and forming part of the Azerbaijan–Russia border. Overview The Samur river originates in g ...

delta. The shoreline is also a unique refuge for plants adapted to the loose sands of the Central Asian Deserts. The principal limiting factors to successful establishment of plant species are hydrological imbalances within the surrounding deltas,

water pollution Water pollution (or aquatic pollution) is the contamination of water bodies, usually as a result of human activities, so that it negatively affects its uses. Water bodies include lakes, rivers, oceans, aquifers, reservoirs and groundwater. ...

, and various land reclamation activities. The water level change within the Caspian Sea is an indirect reason for which plants may not get established. These affect aquatic plants of the Volga Delta, such as '' Aldrovanda vesiculosa'' and the native '' Nelumbo caspica''. About 11 plant species are found in the Samur River delta, including the unique liana forests that date back to the

Tertiary period Tertiary ( ) is a widely used but obsolete term for the geologic period from 66 million to 2.6 million years ago. The period began with the demise of the non-avian dinosaurs in the Cretaceous–Paleogene extinction event, at the start ...

. Since 2019

UNESCO The United Nations Educational, Scientific and Cultural Organization is a specialized agency of the United Nations (UN) aimed at promoting world peace and security through international cooperation in education, arts, sciences and culture. It ...

has admitted the lush

Hyrcanian forests The Hyrcanian forests ( fa, جنگل های هیرکانی) are a zone of lush lowland and montane forests covering about adjoining the shores of the Caspian Sea of Iran and part of that of Azerbaijan. The forest is named after the ancient reg ...

of Mazandaran, Iran as World Heritage Site under category (ix).

Fauna

The

Caspian turtle The Caspian turtle or striped-neck terrapin (''Mauremys caspica'') is a species of turtle in the family Geoemydidae (=Bataguridae), living in the eastern Mediterranean region from southwestern former USSR and central Iran to Saudi Arabia, Bahrai ...

(''Mauremys caspica''), although found in neighboring areas, is a wholly freshwater species. The

zebra mussel The zebra mussel (''Dreissena polymorpha'') is a small freshwater mussel. The species originates from the lakes of southern Russia and Ukraine, but has been accidentally introduced to numerous other areas and has become an invasive species in ma ...

is native to the Caspian and

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Rom ...

basins, but has become an invasive species elsewhere, when introduced. The area has given its name to several species, including the

Caspian gull The Caspian gull (''Larus cachinnans'') is a large gull and a member of the herring and lesser black-backed gull complex. The scientific name is from Latin. ''Larus'' appears to have referred to a gull or other large seabird, and ''cachinnans'' ...

and the

Caspian tern The Caspian tern (''Hydroprogne caspia'') is a species of tern, with a subcosmopolitan but scattered distribution. Despite its extensive range, it is monotypic of its genus, and has no accepted subspecies. The genus name is from Ancient Greek ' ...

. The

Caspian seal The Caspian seal (''Pusa caspica'', syn. ''Phoca caspica'') is one of the smallest members of the earless seal family and unique in that it is found exclusively in the brackish Caspian Sea. It lives along the shorelines, but also on the many roc ...

(''Pusa caspica'') is the only aquatic mammal

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to the Caspian Sea, being one of very few seal species that live in inland waters, but it is different from those inhabiting freshwaters due to the hydrological environment of the sea. A century ago the Caspian was home to more than one million

seals Seals may refer to: * Pinniped, a diverse group of semi-aquatic marine mammals, many of which are commonly called seals, particularly: ** Earless seal, or "true seal" ** Fur seal * Seal (emblem), a device to impress an emblem, used as a means of a ...

. Today, fewer than 10% remain. Archeological studies of Gobustan Rock Art have identified what may be

dolphin A dolphin is an aquatic mammal within the infraorder Cetacea. Dolphin species belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the ...

s and porpoises, likely present in the Caspian Sea at least until the

Quaternary The Quaternary ( ) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). It follows the Neogene Period and spans from 2.58 million years ...

or much more recent periods such as the last glacial period or antiquity. Although the rock art on Kichikdash Mountain is assumed to be of a dolphin it might instead represent the famous

beluga sturgeon The beluga (), also known as the beluga sturgeon or great sturgeon (''Huso huso''), is a species of anadromous fish in the sturgeon family ( Acipenseridae) of order Acipenseriformes. It is found primarily in the Caspian and Black Sea basin ...

due to its size (430 cm in length), but fossil records suggest certain ancestors of modern dolphins and whales, such as '' Macrokentriodon morani'' ( bottlenose dolphins) and ''

Balaenoptera sibbaldina ''Balaenoptera'' () is a genus of rorquals containing eight extant species. ''Balaenoptera'' comprises all but two of the extant species in its family (the humpback whale and gray whale); the genus is currently polyphyletic, with the two aforemen ...

'' (

blue whale The blue whale (''Balaenoptera musculus'') is a marine mammal and a baleen whale. Reaching a maximum confirmed length of and weighing up to , it is the largest animal known to have ever existed. The blue whale's long and slender body can ...

s) were presumably larger than their present descendants. From the same artworks,

auk An auk or alcid is a bird of the family Alcidae in the order Charadriiformes. The alcid family includes the murres, guillemots, auklets, puffins, and murrelets. The word "auk" is derived from Icelandic ''álka'', from Old Norse ''alka'' (a ...

s, like Brunnich's Guillemot could also have been in the sea as well, and these petroglyphs suggest marine inflow between the current Caspian Sea and the Arctic Ocean or

North Sea The North Sea lies between Great Britain, Norway, Denmark, Germany, the Netherlands and Belgium. An epeiric sea, epeiric sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the ...

, or the

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Rom ...

. This is supported by the existences of current endemic, oceanic species such as lagoon cockles which was genetically identified to originate in Caspian/Black Seas regions. The sea's basin (including associated waters such as rivers) has 160 native species and

subspecies In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (morphology), but that can successfully interbreed. Not all species ...

of fish in more than 60 genera.Naseka, A.M. and Bogutskaya, N.G. (2009). "Fishes of the Caspian Sea: zoogeography and updated check-list". ''Zoosystematica Rossica'' 18(2): 295–317. About 62% of the species and subspecies are

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

, as are 4–6 genera (depending on taxonomic treatment). The lake proper has 115 natives, including 73 endemics (63.5%). Among the more than 50 genera in the lake proper, 3–4 are endemic: '' Anatirostrum'', '' Caspiomyzon'', '' Chasar'' (often included in '' Ponticola'') and '' Hyrcanogobius''. By far the most numerous families in the lake proper are

gobies Gobiidae or gobies is a family of bony fish in the order Gobiiformes, one of the largest fish families comprising more than 2,000 species in more than 200 genera. Most of gobiid fish are relatively small, typically less than in length, and the ...

(35 species and subspecies),

cyprinid Cyprinidae is a family of freshwater fish commonly called the carp or minnow family. It includes the carps, the true minnows, and relatives like the barbs and barbels. Cyprinidae is the largest and most diverse fish family and the largest ver ...

s (32) and

clupeid Clupeidae is a family of ray-finned fishes, comprising, for instance, the herrings, shads, sardines, hilsa, and menhadens. The clupeoids include many of the most important food fishes in the world, and are also commonly caught for production of ...

s (22). Two particularly rich genera are '' Alosa'' with 18 endemic species/subspecies and '' Benthophilus'' with 16 endemic species. Other examples of endemics are four species of ''

Clupeonella ''Clupeonella'' is a genus of fish in the family Clupeidae. They are widespread in the fresh and brackish waters of the Caspian Sea and Black drainages. Species * ''Clupeonella abrau'' (Maliatsky, 1930) (Abrau sprat) * ''Clupeonella caspia'' S ...

'', '' Gobio volgensis'', two '' Rutilus'', three ''

Sabanejewia The golden loaches (''Sabanejewia'') are a genus of ray-finned fish in the family Cobitidae. Species There are currently 10 recognized species in this genus: * ''Sabanejewia aurata'' ( De Filippi, 1863) ** ''Sabanejewia aurata aralensis'' (Kessl ...

'', '' Stenodus leucichthys'', two ''

Salmo ''Salmo'' is a genus of ray-finned fish from the family Salmonidae. The single ''Salmo'' species naturally found in the Atlantic North America is the Atlantic salmon, whereas the salmon and trout of the Pacific basin belong to another genus, '' ...

'', two ''

Mesogobius ''Mesogobius'' is one of the genera of benthophiline gobiid fishes native to the basins of the Black and Caspian Seas. Species There are two or three recognized species in this genus:.Brian W. CoadFreshwater Fishes of Iran(accessed 18 Feb 201 ...

'' and three '' Neogobius''. Most non-endemic natives are either shared with the Black Sea basin or widespread

Palearctic The Palearctic or Palaearctic is the largest of the eight biogeographic realms of the Earth. It stretches across all of Eurasia north of the foothills of the Himalayas, and North Africa. The realm consists of several bioregions: the Euro-Sibe ...

species such as

crucian carp The crucian carp (''Carassius carassius'') is a medium-sized member of the common carp family Cyprinidae. It occurs widely in northern European regions. Its name derives from the Low German ''karusse'' or ''karutze'', possibly from Medieval L ...

,

Prussian carp The Prussian carp, silver Prussian carp or Gibel carp (''Carassius gibelio''), is a member of the family Cyprinidae, which includes many other fish, such as the common carp, goldfish, and the smaller minnows. It is a medium-sized cyprinid, and d ...

, common carp,

common bream The common bream, freshwater bream, bream, bronze bream, carp bream or sweaty bream (''Abramis brama''), is a European species of freshwater fish in the family Cyprinidae. It is now considered to be the only species in the genus ''Abramis''. ...

, common bleak, asp,

white bream ''Blicca bjoerkna'', alternatively called the white bream or the silver bream, is a European species of freshwater fish in the family Cyprinidae. Distribution ''Blicca bjoerkna'' is distributed across most of Europe and in adjacent Western Asi ...

, sunbleak, common dace, common roach,

common rudd The common rudd (''Scardinius erythrophthalmus'') is a bentho-pelagic freshwater fish, widely spread in Europe and middle Asia, around the basins of the North, Baltic, Black, Caspian and Aral seas. Identification Morphologically, this specie ...

,

European chub ''Squalius cephalus'' is a European species of freshwater fish in the carp family Cyprinidae. It frequents both slow and moderate rivers, as well as canals and still waters of various kinds. This species is referred to as the common chub, Europe ...

, sichel,

tench The tench or doctor fish (''Tinca tinca'') is a fresh- and brackish-water fish of the order Cypriniformes found throughout Eurasia from Western Europe including the British Isles east into Asia as far as the Ob and Yenisei Rivers. It is also ...

, European weatherfish,

wels catfish The wels catfish ( or ; ''Silurus glanis''), also called sheatfish or just wels, is a large species of catfish native to wide areas of central, southern, and eastern Europe, in the basins of the Baltic, Black and Caspian Seas. It has been introd ...

,

northern pike The northern pike (''Esox lucius'') is a species of carnivorous fish of the genus ''Esox'' (the pikes). They are typical of brackish and fresh waters of the Northern Hemisphere (''i.e.'' holarctic in distribution). They are known simply as a p ...

,

burbot The burbot (''Lota lota'') is the only gadiform (cod-like) freshwater fish. It is also known as bubbot, mariah, loche, cusk, freshwater cod, freshwater ling, freshwater cusk, the lawyer, coney-fish, lingcod, and eelpout. The species is closel ...

,

European perch The European perch (''Perca fluviatilis''), also known as the common perch, redfin perch, big-scaled redfin, English perch, Euro perch, Eurasian perch, Eurasian river perch, Hatch, poor man’s rockfish or in Anglophone parts of Europe, simply th ...

and

zander The zander (''Sander lucioperca''), sander or pikeperch, is a species of ray-finned fish from the family Percidae, which includes the perches, ruffes and darters. It is found in freshwater and brackish habitats in western Eurasia. It is a popul ...

. Almost 30 non-indigenous, introduced fish species have been reported from the Caspian Sea, but only a few have become established. Six sturgeon species, the

Russian Russian(s) refers to anything related to Russia, including: *Russians (, ''russkiye''), an ethnic group of the East Slavic peoples, primarily living in Russia and neighboring countries *Rossiyane (), Russian language term for all citizens and peo ...

,

bastard Bastard may refer to: Parentage * Illegitimate child, a child born to unmarried parents ** Bastard (law of England and Wales), illegitimacy in English law People People with the name * Bastard (surname), including a list of people with that na ...

,

Persian Persian may refer to: * People and things from Iran, historically called ''Persia'' in the English language ** Persians, the majority ethnic group in Iran, not to be conflated with the Iranic peoples ** Persian language, an Iranian language of the ...

,

sterlet The sterlet (''Acipenser ruthenus'') is a relatively small species of sturgeon from Eurasia native to large rivers that flow into the Black Sea, Azov Sea, and Caspian Sea, as well as rivers in Siberia as far east as Yenisei. Populations migratin ...

, starry and

beluga The beluga whale (/bɪˈluːɡə/) (Delphinapterus leucas) is an Arctic and sub-Arctic cetacean. It is one of two members of the family Monodontidae, along with the narwhal, and the only member of the genus Delphinapterus. It is also known as the wh ...

, are native to the Caspian Sea. The last of these is arguably the largest freshwater fish in the world. The sturgeon yield

roe Roe ( ) or hard roe is the fully ripe internal egg masses in the ovaries, or the released external egg masses, of fish and certain marine animals such as shrimp, scallop, sea urchins and squid. As a seafood, roe is used both as a cooked in ...

(eggs) that are processed into

caviar Caviar (also known as caviare; from fa, خاویار, khâvyâr, egg-bearing) is a food consisting of salt-cured roe of the family Acipenseridae. Caviar is considered a delicacy and is eaten as a garnish or a spread. Traditionally, the te ...

. Overfishing has depleted a number of the historic fisheries. In recent years, overfishing has threatened the sturgeon population to the point that

environmentalists An environmentalist is a person who is concerned with and/or advocates for the protection of the environment. An environmentalist can be considered a supporter of the goals of the environmental movement, "a political and ethical movement that se ...

advocate banning sturgeon fishing completely until the population recovers. The high price of sturgeon caviar—more than 1,500

Azerbaijani manat The manat ( ISO code: AZN; sign: ₼; abbreviation: m) is the currency of Azerbaijan. It is subdivided into 100 ''gapiks''. The first iteration of the currency happened in the times of the Azerbaijan Democratic Republic and its successor, the Az ...

s (US$880 ) per kilo—allows fishermen to afford bribes to ensure the authorities look the other way, making regulations in many locations ineffective. Caviar harvesting further endangers the fish stocks, since it targets reproductive females. Extantigerturanianwksciam97

Reptiles native to the region include the

spur-thighed tortoise The Greek tortoise (''Testudo graeca''), also known commonly as the spur-thighed tortoise, is a species of tortoise in the family Testudinidae. ''Testudo graeca'' is one of five species of Mediterranean tortoises ( genera '' Testudo'' and '' A ...

(''Testudo graeca buxtoni'') and Horsfield's tortoise. *The Asiatic cheetah used to occur in the Trans-Caucasus and

Central Asia Central Asia, also known as Middle Asia, is a subregion, region of Asia that stretches from the Caspian Sea in the west to western China and Mongolia in the east, and from Afghanistan and Iran in the south to Russia in the north. It includes t ...

, but is today restricted to Iran.Humphreys, P., Kahrom, E. (1999)
Lion and Gazelle: The Mammals and Birds of Iran
. Images Publishing, Avon. *The

Asiatic lion The Asiatic lion is a population of '' Panthera leo leo'' that today survives in the wild only in India. Since the turn of the 20th century, its range has been restricted to Gir National Park and the surrounding areas in the Indian state of Gujar ...

used to occur in the Trans-Caucasus, Iran, and possibly the southern part of

Turkestan Turkestan, also spelled Turkistan ( fa, ترکستان, Torkestân, lit=Land of the Turks), is a historical region in Central Asia corresponding to the regions of Transoxiana and Xinjiang. Overview Known as Turan to the Persians, western Turk ...

. *The

Caspian tiger The Caspian tiger was a ''Panthera tigris tigris'' population native to eastern Turkey, northern Iran, Mesopotamia, the Caucasus around the Caspian Sea, Central Asia to northern Afghanistan, and the Xinjiang region in western China. Until the M ...

used to occur in northern Iran, the Caucasus and

Central Asia Central Asia, also known as Middle Asia, is a subregion, region of Asia that stretches from the Caspian Sea in the west to western China and Mongolia in the east, and from Afghanistan and Iran in the south to Russia in the north. It includes t ...

. *The endangered

Persian leopard ''Panthera pardus tulliana'' is a leopard subspecies native to the Iranian Plateau and surrounding areas encompassing Turkey, the Caucasus, Azerbaijan, Georgia, Armenia, Iraq, Iran, Turkmenistan, Afghanistan and possibly Pakistan. Since 2016, ...

is found in Iran, the Caucasus and Central Asia.

History

Geology

The main geologic history locally had two stages. The first is the

Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen ...

, determined by

tectonic Tectonics (; ) are the processes that control the structure and properties of the Earth's crust and its evolution through time. These include the processes of mountain building, the growth and behavior of the strong, old cores of continents ...

events that correlate with the closing of the

Tethys Sea The Tethys Ocean ( el, Τηθύς ''Tēthús''), also called the Tethys Sea or the Neo-Tethys, was a prehistoric ocean that covered most of the Earth during much of the Mesozoic Era and early Cenozoic Era, located between the ancient continents ...

. The second is the

Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological Epoch (geology), epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fina ...

noted for its

glaciation A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate be ...

cycles and the full run of the present Volga. During the first stage, the Tethys Sea had evolved into the

Sarmatian The Sarmatians (; grc, Σαρμαται, Sarmatai; Latin: ) were a large confederation of ancient Eastern Iranian equestrian nomadic peoples of classical antiquity who dominated the Pontic steppe from about the 3rd century BC to the 4th cen ...

Lake, that was created from the modern Black Sea and south Caspian, when the collision of the Arabian peninsula with Western Asia pushed up the

Kopet Dag The Köpet Dag, Kopet Dagh, or Koppeh Dagh ( tk, Köpetdag; fa, کپه‌داغ), also known as the Turkmen-Khorasan Mountain Range, is a mountain range on the border between Turkmenistan and Iran that extends about along the border southeast o ...

and

Caucasus Mountains The Caucasus Mountains, : pronounced * hy, Կովկասյան լեռներ, : pronounced * az, Qafqaz dağları, pronounced * rus, Кавка́зские го́ры, Kavkázskiye góry, kɐfˈkasːkʲɪje ˈɡorɨ * tr, Kafkas Dağla ...

, lasting south and west limits to the basin. This orogeneic movement was continuous, while the Caspian was regularly disconnected from the

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Rom ...

. In the late Pontian, a mountain arch rose across the south basin and divided it into the Khachmaz and

Lankaran Lankaran ( az, Lənkəran, ) is a city in Azerbaijan, on the coast of the Caspian Sea, near the southern border with Iran. As of 2021, the city had a population of 89,300. It is next to, but independent of, Lankaran District. The city forms a dis ...

Lakes (or early Balaxani). The period of restriction to the south basin was reversed during the Akchagylian – the lake became more than three times its size today and took again the first of a series of contacts with the Black Sea and with

Lake Aral The Aral Sea ( ; kk, Арал теңізі, Aral teñızı; uz, Орол денгизи, Orol dengizi; kaa, Арал теңизи, Aral teńizi; russian: Аральское море, Aral'skoye more) was an endorheic lake lying between Kazakh ...

. A recession of Lake Akchagyl completed stage one. surikov1906

Early settlement nearby

The earliest hominid remains found around the Caspian Sea are from

Dmanisi Dmanisi ( ka, დმანისი, tr, , az, Başkeçid) is a town and archaeological site in the Kvemo Kartli region of Georgia approximately 93 km southwest of the nation’s capital Tbilisi in the river valley of Mashavera. The hominin ...

dating back to around 1.8 Ma and yielded a number of skeletal remains of

Homo erectus ''Homo erectus'' (; meaning "upright man") is an extinct species of archaic human from the Pleistocene, with its earliest occurrence about 2 million years ago. Several human species, such as '' H. heidelbergensis'' and '' H. antecessor' ...

or

Homo ergaster ''Homo ergaster'' is an extinct species or subspecies of archaic humans who lived in Africa in the Early Pleistocene. Whether ''H. ergaster'' constitutes a species of its own or should be subsumed into '' H. erectus'' is an ongoing and unresol ...

. More later evidence for human occupation of the region came from a number of caves in

Georgia Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ...

and Azerbaijan such as Kudaro and

Azykh Cave Azykh Cave ( az, Azıx mağarası), also referred to as Azokh Cave () is a six-cave complex in Azerbaijan, known as a habitation site of prehistoric humans. It is situated near the village of Azykh in the Khojavend District. The cave is an impor ...

s. There is evidence for

Lower Palaeolithic The Lower Paleolithic (or Lower Palaeolithic) is the earliest subdivision of the Paleolithic or Old Stone Age. It spans the time from around 3 million years ago when the first evidence for stone tool production and use by hominins appears ...

human occupation south of the Caspian from western Alburz. These are Ganj Par and

Darband Cave Darband Cave is a Lower Paleolithic site in the Gilan Province in northern Iran, located on the north side of a deep tributary canyon of the Siahrud River, a tributary of the Sefīd-Rūd River that flows into the Caspian Sea. The cave contain ...

sites.

Neanderthal Neanderthals (, also ''Homo neanderthalensis'' and erroneously ''Homo sapiens neanderthalensis''), also written as Neandertals, are an extinct species or subspecies of archaic humans who lived in Eurasia until about 40,000 years ago. While th ...

remains also have been discovered at a cave in Georgia. Discoveries in the Hotu cave and the adjacent Kamarband cave, near the town of Behshahr, Mazandaran south of the Caspian in Iran, suggest human habitation of the area as early as 11,000 years ago. Ancient Greeks focused on the civilization on the south shore – they call it the (H)yr(c/k)anian Sea ( grc, Υρκανία θάλαττα, with sources noting the latter word was evolving then to today's ''Thelessa'': late grc, θάλασσα).

Chinese maximal limit

Later, in the

Tang dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an imperial dynasty of China that ruled from 618 to 907 AD, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdom ...

(618-907), the sea was the western limit of the Chinese Empire.

Fossil fuel

The area is rich in fossil fuels. Oil wells were being dug in the region as early as the 10th century to reach oil "for use in everyday life, both for medicinal purposes and for heating and lighting in homes"."The Development of the Oil and Gas Industry in Azerbaijan
". SOCAR By the 16th century, Europeans were aware of the rich oil and gas deposits locally. English traders

Thomas Bannister Thomas Bannister (1799–1874) was a soldier and explorer in Western Australia. He was born in Steyning, Sussex in 1799, and arrived in Western Australia in 1829, age 30, with the rank of Captain aboard the ''Atwick'' with 3 servants from Londo ...

and Jeffrey Duckett described the area around Baku as "a strange thing to behold, for there issueth out of the ground a marvelous quantity of oil, which serveth all the country to burn in their houses. This oil is black and is called nefte. There is also by the town of Baku, another kind of oil which is white and very precious .e.,_petroleum.html" ;"title="petroleum.html" ;"title=".e., petroleum">.e., petroleum">petroleum.html" ;"title=".e., petroleum">.e., petroleum""Back to the Future: Britain, Baku Oil and the Cycle of History
". SOCAR Today, oil and gas platforms abound along the edges of the sea.

Geography, geology and navigation studies

During the rule of Peter I the Great, Fedor Ivanovich Soimonov, Fedor I. Soimonov was a pioneering explorer of the sea. He was a hydrographer who charted and greatly expanded knowledge of the sea. He drew a set of four maps and wrote ''Pilot of the Caspian Sea'', the first lengthy report and modern maps. These were published in 1720 by the

Russian Academy of Sciences The Russian Academy of Sciences (RAS; russian: Росси́йская акаде́мия нау́к (РАН) ''Rossíyskaya akadémiya naúk'') consists of the national academy of Russia; a network of scientific research institutes from across ...

.

Cities

Ancient

*

Hyrcania Hyrcania () ( el, ''Hyrkania'', Old Persian: 𐎺𐎼𐎣𐎠𐎴 ''Varkâna'',Lendering (1996) Middle Persian: 𐭢𐭥𐭫𐭢𐭠𐭭 ''Gurgān'', Akkadian: ''Urqananu'') is a historical region composed of the land south-east of the Caspian ...

, ancient state in the north of Iran *

Sari A sari (sometimes also saree or shari)The name of the garment in various regional languages include: * as, শাৰী, xārī, translit-std=ISO * bn, শাড়ি, śāṛi, translit-std=ISO * gu, સાડી, sāḍī, translit-std ...

, Mazandaran Province of Iran * Anzali, Gilan Province of Iran * Astara, Gilan Province of Iran *

Astarabad Gorgan ( fa, گرگان ; also romanized as ''Gorgān'', ''Gurgān'', and ''Gurgan''), formerly Esterabad ( ; also romanized as ''Astarābād'', ''Asterabad'', and ''Esterābād''), is the capital city of Golestan Province, Iran. It lies app ...

, Golestan Province of Iran * Tamisheh, Golestan Province of Iran * Atil, Khazaria *

Khazaran Khazaran was a city in the Khazar kingdom, located on the eastern bank of the lower Volga River. It was connected to Atil by a pontoon bridge. Khazaran was later inhabited primarily by Muslims and featured numerous mosques, minarets, and madrasas ...

* Baku, Azerbaijan *

Derbent Derbent (russian: Дербе́нт; lez, Кьвевар, Цал; az, Дәрбәнд, italic=no, Dərbənd; av, Дербенд; fa, دربند), formerly romanized as Derbend, is a city in Dagestan, Russia, located on the Caspian Sea. It i ...

, Dagestan, Russia *

Xacitarxan Hajji Tarkhan or Hajji Tarkhan al Jedid ( tt-Cyrl, Хаҗитархан, translit=Xacitarxan), also known as Hashtar Khan / Astarxan ( tt-Latn, Astarxan) or Astrakhan,in Persian sources: حاجی‌ترخان Haji-Tarkhan; Russian sources: Аст ...

, modern-day

Astrakhan Astrakhan ( rus, Астрахань, p=ˈastrəxənʲ) is the largest city and administrative centre of Astrakhan Oblast in Southern Russia. The city lies on two banks of the Volga, in the upper part of the Volga Delta, on eleven islands of the ...

Modern

*

Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...

: ** Ali Abad ** Astane-ye Ashrafiye ** Astara **

Babolsar Babolsar ( fa, بابلسر, also Romanized as Bābolsar and Bābul Sar; also known as Mashhadsar (Persian: مَشهَدسَر), also Romanized as Mashhad-i-Sar and Meshed-i-Sar) is a city and capital of Babolsar County, Mazandaran Province, Ira ...

**

Bandar-e Anzali Bandar-e Anzali ( fa, بندرانزلی, also Romanized as Bandar-e Anzalī; renamed as Bandar-e Pahlavi during the Pahlavi dynasty) is a city of Gilan Province, Iran. At the 2011 census, its population was 144,664. Anzali is one of the mos ...

** Bandar-e-Gaz ** Bandar Torkaman ** Behshahr ** Chalus ** Fenderesk ** Gomishan **

Gonbad-e Kavus Gonbad-e Kavus ( fa, گنبد کاووس, Gonbade Kâvus) is a city in Golestan province, Iran. The modern name, meaning "the tower of Kavus", is a reference to the most imposing ancient monument in the city. The historic name cannot now be rest ...

**

Gorgan Gorgan ( fa, گرگان ; also romanized as ''Gorgān'', ''Gurgān'', and ''Gurgan''), formerly Esterabad ( ; also romanized as ''Astarābād'', ''Asterabad'', and ''Esterābād''), is the capital city of Golestan Province, Iran. It lies appro ...

** Juybar ** Kordkuy **

Lahijan Lahijan ( fa, لاهیجان, Lāhijān, also known as, Lāyjon in Gilaki) is a city near the Caspian Sea and the capital of Lahijan County, Gilan Province, Iran. According to the 2016 census, its population was 167,544 in 58,378 families. La ...

**

Langarud Langarud ( fa, لنگرود, also Romanized as Langarūd, Langerūd, Langaroud and Langarood; also known as Shahr-e Langarūd), is a city and capital of Langarud County, Gilan Province, Iran. The 2017 census showed the population as 79,445. La ...

** Mahmudabad **

Neka Neka ( fa, نكا, also Romanized as Nekā’ and Nekā; also known as Nīkā; formerly, Nāranj Bāgh) is a city and capital of Neka County, Mazandaran Province, Iran. At the 2006 census, its population was 46,152, in 11,941 families. Geograph ...

**

Nowshahr Nowshahr ( fa, نوشهر; also Romanized as Now Shahr, Noshahr, and Nau Shahr; also known as Bandar-e Noshahr and the former name was Dehno) is a city and capital of Nowshahr County, Mazandaran Province, Iran. The largest ethnic group in Nowsha ...

** Nur **

Ramsar Ramsar may refer to: * Places so named: ** Ramsar, Mazandaran, city in Iran ** Ramsar, Rajasthan, village in India * Eponyms of the Iranian city: ** Ramsar Convention concerning wetlands, signed in Ramsar, Iran ** Ramsar site, wetland listed in ...

**

Rasht Rasht ( fa, رشت, Rašt ; glk, Rəšt, script=Latn; also romanized as Resht and Rast, and often spelt ''Recht'' in French and older German manuscripts) is the capital city of Gilan Province, Iran. Also known as the "City of Rain" (, ''Ŝahre B ...

**

Rudbar Rudbar ( fa, رودبار, Rudbār) ( Gilaki:, ''rubâr'') is a city and capital of Rudbar County, Gilan Province, Iran. At the 2006 census, its population was 11,454, in 3,303 families. Rudbar is from Tehran and with a variable climate. It ...

**

Rudsar Rudsar ( fa, رودسر, also known as, Roodsar, Rūdsar and Rūd-i-Sar) is a city and capital of Rudsar County, Gilan Province, Iran. At the 2006 census, its population was 33,321, in 9,741 families. Geography Rudsar is located on the Casp ...

**

Sari A sari (sometimes also saree or shari)The name of the garment in various regional languages include: * as, শাৰী, xārī, translit-std=ISO * bn, শাড়ি, śāṛi, translit-std=ISO * gu, સાડી, sāḍī, translit-std ...

** Sorkhrud **

Tonekabon Tonekabon ( fa, تنكابن, also Romanized as Tonekābon; formerly known as Shahsavar (Persian: شَهسَوار), also Romanized as Shahsavār and Shahsawār) is a city and capital of Tonekabon County, Mazandaran Province, northern Iran. At ...

*

Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of t ...

: ** Astara ** Baku ** Gobustan **

Khudat , native_name = , pushpin_map = Azerbaijan , pushpin_mapsize = 300 , subdivision_type = Country , subdivision_name = , subdivision_type1 = District , subdivision_name1 = Kh ...

** Khachmaz **

Lankaran Lankaran ( az, Lənkəran, ) is a city in Azerbaijan, on the coast of the Caspian Sea, near the southern border with Iran. As of 2021, the city had a population of 89,300. It is next to, but independent of, Lankaran District. The city forms a dis ...

**

Masallı Masallı () is a city in and the capital of the Masally District of Azerbaijan. History Masally city was established in 1960. The name of the city comes from the name of a tribe – “Masal” that lived in the territory of Masally in ancient ...

**

Nabran Nabran is the municipality of the capital city of the Khachmaz region which is located in Khachmaz Rayon of Azerbaijan, close to the Russia-Azerbaijan border. It has a population of 300,000. The municipality consists of the following villages Nabra ...

** Neftchala **

Shabran Shabran District ( az, Şabran rayonu) is one of the 66 districts of Azerbaijan. It is located in the north-east of the country and belongs to the Guba-Khachmaz Economic Region. The district borders the districts of Khachmaz, Quba, Khizi and ...

**

Siyazan Siyazan ( az, Siyəzən; Tat language (Caucasus), Tat: ''Siyəzən'') is a city, municipality and the capital of the Siyazan District of Azerbaijan. It has a population of 24,900. The city's name is said to be derived from Persian language, Persi ...

**

Oil Rocks An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) & lipophilic (mixes with other oils). Oils are usually flammable and surface active. Most oils are unsaturated ...

**

Sumqayit Sumgait (; az, Sumqayıt, ) is a city in Azerbaijan, located near the Caspian Sea, on the Absheron Peninsula, about away from the capital Baku. The city has a population of around 345,300, making it the second largest city in Azerbaijan after Bak ...

*

Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...

: ** Atyrau **

Aktau Aktau ( kk, Aqtau, Ақтау , russian: Актау) is a city in Kazakhstan, located on the eastern shore of the Caspian Sea. Its current name means "white mountain" in Kazakh, which may be due to its cliffs that overlook the Caspian. From 1964 to ...

*Russia: **

Astrakhan Astrakhan ( rus, Астрахань, p=ˈastrəxənʲ) is the largest city and administrative centre of Astrakhan Oblast in Southern Russia. The city lies on two banks of the Volga, in the upper part of the Volga Delta, on eleven islands of the ...

**

Dagestanskiye Ogni Dagestanskiye Ogni (russian: Дагестанские Огни ; tab, Дагъустнан ЦIаяр; az, Дағыстан Ишыглары, ''Dağıstan İşıqları''; lez, Дагъустандин ЦӀаяр) is a town in the Republic of Da ...

**

Derbent Derbent (russian: Дербе́нт; lez, Кьвевар, Цал; az, Дәрбәнд, italic=no, Dərbənd; av, Дербенд; fa, دربند), formerly romanized as Derbend, is a city in Dagestan, Russia, located on the Caspian Sea. It i ...

**

Izberbash Izberbash (russian: Изберба́ш; Dargwa: Избир; kum, Йизбирба́ш, ''Yizbirbaş'') is a town in the Republic of Dagestan, Russia, located on the coast of the Caspian Sea southeast of Makhachkala, the capital of the republic. ...

**

Kaspiysk Kaspiysk (russian: Каспи́йск; lbe, Ккасппи; av, Каспиялъухъ) is a city in the Republic of Dagestan, Russia, located on the Caspian Sea, southeast of Makhachkala. The 2010 Russian census recorded the city as being the ...

**

Makhachkala Makhachkala ( rus, Махачкала, , məxətɕkɐˈla, links=yes),; av, Махӏачхъала, Maħaçqala; ce, ХӀинжа-ГӀала, Hinƶa-Ġala; az, Маһачгала, Mahaçqala; nog, Махачкала; lbe, Махачкъала; ...

* Turkmenistan: ** Türkmenbaşy (formerly Krasnovodsk) ** Hazar (formerly Çeleken) **

Esenguly Esenguly (formerly Hasan-Kuly, Gasan-Kuli) is a city in and administrative center of Esenguly District, Balkan Province, Turkmenistan. In 1989 its population was 5,823. Etymology The name is of obscure origin. A clan of that name, part of the Yo ...

**

Garabogaz Garabogaz () is a city subordinate to Turkmenbashy District, Balkan province, Turkmenistan, on the shore of the Caspian Sea. Until 2002, the municipality had the status of a town and was named ''Bekdaş'' . Etymology The city takes its name fr ...

(formerly Bekdaş)

Economy

Countries in the Caspian region, particularly

Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of t ...

,

Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...

and Turkmenistan, have high-value natural-resource-based economies, where the oil and gas compose more than 10 percent of their

GDP Gross domestic product (GDP) is a monetary measure of the market value of all the final goods and services produced and sold (not resold) in a specific time period by countries. Due to its complex and subjective nature this measure is ofte ...

and 40 percent of their exports. All the Caspian region economies are highly dependent on this type of

mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2 ...

wealth. The

world energy market World energy supply and consumption is global production and preparation of fuel, generation of electricity, energy transport, and energy consumption. It is a basic part of economic activity. It includes heat, but not energy from food. This a ...

s were influenced by Azerbaijan and Kazakhstan, as they became strategically crucial in this sphere, thus attracting the largest share of FDI (foreign direct investment). All of the countries are rich in solar energy and harnessing potential, with the highest rainfall much less than the mountains of central Europe in the mountains of the west, which are also rich in

hydroelectricity Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined an ...

sources.

Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...

has high fossil fuel energy potential. It has reserves of 137.5 billion

barrels A barrel or cask is a hollow cylindrical container with a bulging center, longer than it is wide. They are traditionally made of wooden staves and bound by wooden or metal hoops. The word vat is often used for large containers for liquids, u ...

of

crude oil Petroleum, also known as crude oil, or simply oil, is a naturally occurring yellowish-black liquid mixture of mainly hydrocarbons, and is found in geological formations. The name ''petroleum'' covers both naturally occurring unprocessed crude ...

, the fourth largest in the world, producing around four million barrels a day. Iran has an estimated 988.4 trillion cubic feet of

natural gas Natural gas (also called fossil gas or simply gas) is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane in addition to various smaller amounts of other higher alkanes. Low levels of trace gases like carbo ...

, around 16 percent of world reserves, thus key to current paradigms in global energy security. Russia's economy ranks as the twelfth largest by

nominal GDP Gross domestic product (GDP) is a money, monetary Measurement in economics, measure of the market value of all the final goods and services produced and sold (not resold) in a specific time period by countries. Due to its complex and subjec ...

and sixth largest by purchasing power parity in 2015. Russia's extensive mineral and energy resources are the largest such reserves in the world, making it the second leading producer of oil and

natural gas Natural gas (also called fossil gas or simply gas) is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane in addition to various smaller amounts of other higher alkanes. Low levels of trace gases like carbo ...

globally. Caspian

littoral The littoral zone or nearshore is the part of a sea, lake, or river that is close to the shore. In coastal ecology, the littoral zone includes the intertidal zone extending from the high water mark (which is rarely inundated), to coastal a ...

states join efforts to develop infrastructure, tourism and trade in the region. The first Caspian Economic Forum was convened on August 12, 2019, in Turkmenistan and brought together representatives of Kazakhstan, Russia, Azerbaijan, Iran and that state. It hosted several meetings of their ministers of economy and transport. The Caspian countries develop robust cooperation in the tech and digital field as part of the Caspian Digital Hub. The project helps expand data transmission capabilities in Kazakhstan as well as data transit capabilities between Asia and Europe. The project generated interest from investors from all over the world, including the UK.

Oil and gas

The Caspian Sea region presently is a significant, but not major, supplier of

crude oil Petroleum, also known as crude oil, or simply oil, is a naturally occurring yellowish-black liquid mixture of mainly hydrocarbons, and is found in geological formations. The name ''petroleum'' covers both naturally occurring unprocessed crude ...

to world markets, based upon estimates by BP-Amoco, BP Amoco and the U.S. Energy Information Administration, United States Department of Energy, U.S. Department of Energy. The region output about 1.4–1.5 million Barrels of oil, barrels per day plus natural Gasoline, gas liquids in 2001, 1.9% of total world output. More than a dozen countries output more than this top figure. Caspian region production has been higher, but waned during and after the collapse of the Soviet Union.

Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...

accounts for 55% and

Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of t ...

for about 20% of the states' Extraction of petroleum, oil output. Caspian region oil and natural gas infrastructure

The world's first offshore wells and machine-drilled wells were made in Bibi-Heybat Bay, near Baku, Azerbaijan. In 1873, exploration and development of oil began in some of the largest fields known to exist in the world at that time on the Absheron Peninsula near the villages of Balaxanı, Balakhanli, Sabanchi, Yanaulsky District, Republic of Bashkortostan, Sabunchi, Ramana, and Bibi Heybat. Total recoverable reserves were more than 500 million tons. By 1900, Baku had more than 3,000 oil wells, 2,000 of which were producing at industrial levels. By the end of the 19th century, Baku became known as the "black gold capital", and many skilled workers and specialists flocked to the city. By the beginning of the 20th century, Baku was the center of the international oil industry. In 1920, when the Bolsheviks captured

Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of t ...

, all private property, including oil wells and factories, was confiscated. Rapidly the republic's oil industry came under the control of the Soviet Union. By 1941, Azerbaijan was producing a record 23.5 million tons of oil per year – its Baku region output was nearly 72 percent of the Soviet Union's oil. In 1994, the "Contract of the Century (Azerbaijan), Contract of the Century" was signed, heralding extra-regional development of the Baku oil fields. The large Baku–Tbilisi–Ceyhan pipeline conveys Azeri oil to the Turkish Mediterranean port of Ceyhan and opened in 2006. The oil field in the Russian section of the body of water was discovered in 2005. It is reportedly the largest found in 25 years. It was announced in October 2016 that Lukoil would start production from it.

Transport

Baku has the main moorings of all large vessels, such as oil tankers, in

Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of t ...

. It is the largest port of the Caspian Sea. The port (and tankers) have access to the oceans along the Caspian Sea–Volga–Don River (Russia), Don Volga–Don Canal, Canal, and the Don–Sea of Azov. A northern alternate is the Volga–Baltic Waterway, Volga–Baltic (a sea which has a connection to the

North Sea The North Sea lies between Great Britain, Norway, Denmark, Germany, the Netherlands and Belgium. An epeiric sea, epeiric sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the ...

of the Atlantic, as the White Sea does via the White Sea–Baltic Canal, White Sea-Baltic canal. Baku Sea Trade Port and Caspian Shipping Company CJSC, have a big role in the sea transportation of Azerbaijan. The Caspian Sea Shipping Company CJSC has two fleets plus shipyards. Its transport fleet has 51 vessels: 20 tankers, 13 ferries, 15 universal dry cargo vessels, 2 Ro-Ro vessels, as well as 1 technical vessel and 1 floating workshop. Its specialized fleet has 210 vessels: 20 cranes, 25 towing and supplying vehicles, 26 passenger, two pipe-laying, six fire-fighting, seven engineering-geological, two diving and 88 auxiliary vessels. The Caspian Sea Shipping Company of Azerbaijan, which acts as a liaison in the Transport Corridor Europe-Caucasus-Asia (TRACECA), simultaneously with the transportation of cargo and passengers in the Trans-Caspian direction, also performs work to fully ensure the processes of oil and gas production at sea. In the 19th century, the sharp increase in oil production in Baku gave a huge impetus to the development of shipping in the Caspian Sea, and as a result, there was a need to create fundamentally new floating facilities for the transportation of oil and oil products.

Political issues

Many of the islands along the Azerbaijani coast retain great geopolitical and economic importance for demarcation-line oil fields relying on their national status. Bulla Island, Pirallahı Island, and Nargin (island), Nargin, which is still used as a former Soviet Union, Soviet base and is the largest island in the Baku bay, hold oil reserves. The collapse of the Soviet Union allowed the market opening of the region. This led to intense investment and development by international oil companies. In 1998, Dick Cheney commented that "I can't think of a time when we've had a region emerge as suddenly to become as strategically significant as the Caspian." A key problem to further local development is arriving at precise, agreed demarcation lines among the five

littoral The littoral zone or nearshore is the part of a sea, lake, or river that is close to the shore. In coastal ecology, the littoral zone includes the intertidal zone extending from the high water mark (which is rarely inundated), to coastal a ...

states. The current disputes along Azerbaijan's maritime borders with Turkmenistan and Iran could impinge future development. Much controversy currently exists over the proposed Trans-Caspian Oil Transport System, Trans-Caspian oil and gas pipelines. These projects would allow Western markets easier access to Kazakh oil and, potentially, Uzbek and Turkmen gas as well. Russia officially opposes the project on environmental grounds.Sergei Blagov,
Russia Tries to Scuttle Proposed Trans-Caspian Pipeline
", Eurasianet (2006-03-27) However, analysts note that the pipelines would bypass Russia completely, thereby denying the country valuable transit fees, as well as destroying its current monopoly on westward-bound hydrocarbon exports from the region. Recently, both Kazakhstan and Turkmenistan have expressed their support for the Trans-Caspian Pipeline. U.S. diplomatic cables disclosed by WikiLeaks revealed that BP covered up a gas leak and Blowout (well drilling), blowout incident in September 2008 at an operating gas field in the Azeri-Chirag-Guneshi area of the Azerbaijan Caspian Sea.

Territorial status

Iran southern caspian energy prospects 2004

Coastline

Five states are located along about of Caspian coastline. The length of the coastline of these countries: # Kazakhstan - # Turkmenistan - # Azerbaijan - # Russia - # Iran -

Negotiations

In 2000, negotiations as to the Demarcation line, demarcation of the sea had been going on for nearly a decade among all the states bordering it. Whether it was by law a sea, a lake, or an agreed hybrid, the decision would set the demarcation rules and was heavily debated. Access to mineral resources (petroleum, oil and

natural gas Natural gas (also called fossil gas or simply gas) is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane in addition to various smaller amounts of other higher alkanes. Low levels of trace gases like carbo ...

), access for fishing, and access to international waters (through Russia's

Volga The Volga (; russian: Во́лга, a=Ru-Волга.ogg, p=ˈvoɫɡə) is the longest river in Europe. Situated in Russia, it flows through Central Russia to Southern Russia and into the Caspian Sea. The Volga has a length of , and a catchm ...

river and the canals connecting it to the

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Rom ...

and Baltic Sea) all rest on the negotiations' outcome. Access to the Volga is key for market efficiency and economic diversity of the landlocked states of Azerbaijan, Kazakhstan, and Turkmenistan. This concerns Russia as more traffic seeks to use — and at some points congest — its inland waterways. If the body of water is, by law, a sea, many precedents and international treaties oblige free access to foreign vessels. If it is a lake there are no such obligations. Resolving and improving some Environment (biophysical), environmental issues properly rests on the status and borders issue. All five Caspian littoral states maintain naval forces on the sea. According to a treaty signed between Iran and the Soviet Union, the sea is technically a lake and was divided into two sectors (Iranian and Soviet), but the resources (then mainly fish) were commonly shared. The line between the two sectors was considered an international border in a common lake, like Lake Albert (Africa), Lake Albert. The Soviet sector was sub-divided into the four littoral republics' administrative sectors. Russia, Kazakhstan, and Azerbaijan have bilateral agreements with each other based on median lines. Because of their use by the three nations, median lines seem to be the most likely method of delineating territory in future agreements. However, Iran insists on a single, multilateral agreement between the five nations (aiming for a one-fifth share). Azerbaijan is at odds with Iran over some of the sea's oil fields. Occasionally, Iranian patrol boats have fired at vessels sent by Azerbaijan for exploration into the disputed region. There are similar tensions between Azerbaijan and Turkmenistan (the latter claims that the former has pumped more oil than agreed from a field, recognized by both parties as shared). The Caspian littoral states' meeting in 2007 signed an accord that only allows littoral-state flag-bearing ships to enter the sea. Negotiations among the five states ebbed and flowed, from about 1990 to 2018. Progress was notable in the fourth Caspian Summit held in

Astrakhan Astrakhan ( rus, Астрахань, p=ˈastrəxənʲ) is the largest city and administrative centre of Astrakhan Oblast in Southern Russia. The city lies on two banks of the Volga, in the upper part of the Volga Delta, on eleven islands of the ...

in 2014.

Caspian Summit

The Caspian Summit is a head of state-level meeting of the five littoral states. The fifth Caspian Summit took place on August 12, 2018, in the Kazakh port city of

Aktau Aktau ( kk, Aqtau, Ақтау , russian: Актау) is a city in Kazakhstan, located on the eastern shore of the Caspian Sea. Its current name means "white mountain" in Kazakh, which may be due to its cliffs that overlook the Caspian. From 1964 to ...

. The five leaders signed the ‘Convention on the Legal Status of the Caspian Sea’. Representatives of the Caspian littoral states held a meeting in the capital of Kazakhstan on September 28, 2018, as a follow-up to the Aktau Summit. The conference was hosted by the Kazakh Ministry of Investment and Development. The participants in the meeting agreed to host an investment forum for the Caspian region every two years.

Convention on the legal status of the Caspian Sea

The five littoral states build consensus on legally binding governance of the Caspian Sea through Special Working Groups of a Convention on the Legal Status of the Caspian Sea. In advance of a Caspian Summit, the 51st Special Working Group took place in Astana in May 2018 and found consensus on multiple agreements: Agreements on cooperation in the field of transport; trade and economic cooperation; prevention of incidents on the sea; combating terrorism; fighting against organized crime; and border security cooperation. The convention grants jurisdiction over of territorial waters to each neighboring country, plus an additional of exclusive fishing rights on the surface, while the rest is international waters. The seabed, on the other hand, remains undefined, subject to bilateral agreements between countries. Thus, the Caspian Sea is legally neither fully a sea nor a lake. While the convention addresses caviar production, oil and gas extraction, and military uses, it does not touch on environmental issues.

Crossborder inflow

UNECE recognizes several rivers that cross international borders which flow into the Caspian Sea. These are:

Transportation

Although the Caspian Sea is endorheic, its main tributary, the

Volga The Volga (; russian: Во́лга, a=Ru-Волга.ogg, p=ˈvoɫɡə) is the longest river in Europe. Situated in Russia, it flows through Central Russia to Southern Russia and into the Caspian Sea. The Volga has a length of , and a catchm ...

, is connected by important shipping canals Volga–Don Canal, with the Don River (and thus the Black Sea) and Volga–Baltic Waterway, with the Baltic Sea, with branch canals Northern Dvina Canal, to Northern Dvina and White Sea–Baltic Canal, to the White Sea. Another Caspian tributary, the Kuma River (Russia), Kuma River, is connected by Kuma–Manych Canal, an irrigation canal with the Don basin as well. Scheduled ferry services (including Train ferry, train ferries) across the sea chiefly are between: * Türkmenbaşy in Turkmenistan, (formerly Türkmenbaşy, Turkmenistan, Krasnovodsk) and Baku. *

Aktau Aktau ( kk, Aqtau, Ақтау , russian: Актау) is a city in Kazakhstan, located on the eastern shore of the Caspian Sea. Its current name means "white mountain" in Kazakh, which may be due to its cliffs that overlook the Caspian. From 1964 to ...

, Kazakhstan and Baku. *Cities in Iran and Russia (chiefly for cargo.)

Canals

As an

endorheic basin An endorheic basin (; also spelled endoreic basin or endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but drainage converges instead into lakes ...

, the Caspian Sea basin has no natural connection with the ocean. Since the Medieval Period, medieval period, traders reached the Caspian via a number of portages that connected the Volga and its tributaries with the Don River (Russia), Don River (which flows into the Sea of Azov) and various rivers that flow into the Baltic Sea. Volga–Baltic Waterway#History, Primitive canals connecting the Volga Basin with the Baltic were constructed as early as the early 18th century. Since then, a number of canal projects have been completed. The two modern canal systems that connect the Volga Basin, and hence the Caspian Sea, with the ocean are the Volga–Baltic Waterway and the Volga–Don Canal. The proposed Pechora–Kama Canal was a project that was widely discussed between the 1930s and 1980s. Shipping was a secondary consideration. Its main goal was to Northern river reversal, redirect some of the water of the Pechora River (which flows into the Arctic Ocean) via the Kama River into the Volga. The goals were both irrigation and the stabilization of the water level in the Caspian, which was thought to be falling dangerously fast at the time. During 1971, some peaceful nuclear explosion, peaceful nuclear construction experiments were carried out in the region by the U.S.S.R. In June 2007, in order to boost his oil-rich country's access to markets,

Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...

's President Nursultan Nazarbayev proposed a link between the Caspian Sea and the

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Rom ...

. It is hoped that the "Eurasia Canal" (Manych Ship Canal) would transform landlocked Kazakhstan and other Central Asia, Central Asian countries into maritime states, enabling them to significantly increase trade volume. Although the canal would traverse Russian territory, it would benefit Kazakhstan through its Caspian Sea ports. The most likely route for the canal, the officials at the Committee on Water Resources at Kazakhstan's Agriculture Ministry say, would follow the Kuma–Manych Depression, where currently a chain of rivers and lakes is already connected by an irrigation canal (the Kuma–Manych Canal). Upgrading the Volga–Don Canal would be another option."Caspian Canal Could Boost Kazakh Trade"
''Business Week'' (2007-07-09)

References

External links

*
Names of the Caspian Sea

Caspian Sea Region

{{Authority control Caspian Sea, Ancient lakes Azerbaijan–Iran border Azerbaijan–Russia border Bodies of water of Iran Border tripoints Endorheic lakes of Europe Endorheic lakes of Asia Eutrophication Geography of Central Asia Geography of Eastern Europe Geography of Southern Russia Geography of Western Asia International disputes International lakes of Asia International lakes of Europe Iran–Soviet Union border Iran–Turkmenistan border Kazakhstan–Russia border Kazakhstan–Turkmenistan border Lakes of Astrakhan Oblast Lakes of Azerbaijan Lakes of Dagestan Lakes of Iran Lakes of Kalmykia Lakes of Kazakhstan Lakes of Turkmenistan Landforms of Central Asia Landforms of Western Asia Lowest points Saline lakes of Asia Saline lakes of Europe Seas of Iran

Etymology

Basin countries

Border countries

Non-border countries

Physical characteristics

Formation

Geography

Climate

Hydrology

Environmental degradation

Flora and fauna

Flora

Fauna

History

Geology

Early settlement nearby

Chinese maximal limit

Fossil fuel

Geography, geology and navigation studies

Cities

Ancient

Modern

Economy

Oil and gas

Transport

Political issues

Territorial status

Coastline

Negotiations

Caspian Summit

Convention on the legal status of the Caspian Sea

Crossborder inflow

Transportation

Canals

See also

References

External links