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Ras Siyyan
Ras Siyyan or Ras Siyan ( ar, رأس سيان) is a peninsula in the Obock Region of Djibouti, on the Bab-el-Mandeb strait (between the Red Sea and the Gulf of Aden), about 20 km southwest of Perim Island. The peninsula consists of a reddish volcanic hill about 1.2 by 0.5 km and 138 m high, Sailing Directions (Enroute) - Red Sea and Persian Gulf'' page 161. National Geospatial Intelligence Agency pub. 172. Accessed 2012-07-6. connected towards to the mainland by a low sandy strip that stretches south by about 5 km while widening from 500 to 800 m.William James Lloyd Wharton, John Phillips (1900), The Red Sea and Gulf of Aden Pilot' page 230. Great Britain Hydrographic Offic. The Ras Siyyan volcano is currently inactive but young, having erupted through a 21,000-year-old coral reef formation. To the west of Ras Siyyan there is a shallow marshy bay or lagoon, about 2.5 km wide, protected on the north side by shallow coral banks. The bay is fringed with patches of mangrove bush ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bab El Mandeb NASA With Description
Bab or BAB can refer to: *Bab (toponymy), a component of Arabic toponyms literally meaning "gate" * Set (mythology) (also known as Bab, Baba, or Seth) ancient Egyptian God * Bab (Shia Islam), a term designating deputies of the Imams in Shia Islam * Báb (Sayyid `Alí Muḥammad Shírází, 1819–1850), founder of Bábism and a central figure in the Bahá'í Faith * Bab-ı Âli, the gate to the palace of the Grand vizier of the Ottoman Empire * Báb, Nitra District, a village and municipality in the Nitra District in western central Slovakia * Bab Ballads, cartoons published by W. S. Gilbert under the childhood nickname, ''Bab'' * Back-arc basin, a geologic feature: a submarine basin associated with island arcs and subduction zones * "Base Attack Bonus", a term used in d20 System RPG games * Beale Air Force Base (IATA airport code: BAB), in California * ''Biotechnology and Applied Biochemistry'', an academic journal * Boris Berezovsky (businessman) (1946–2013), Boris Abramovic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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'') and ''atoll lagoons''. They have also been identified as occurring on mixed-sand and gravel coastlines. There is an overlap between bodies of water classified as coastal lagoons and bodies of water classified as estuaries. Lagoons are common coastal features around many parts of the world. Definition and terminology Lagoons are shallow, often elongated bodies of water separated from a larger body of water by a shallow or exposed shoal, coral reef, or similar feature. Some authorities include fresh water bodies in the definition of "lagoon", while others explicitly restrict "lagoon" to bodies of water with some degree of salinity. The distinction between "lagoon" and "estuary" also varies between authorities. Richard A. Davis Jr. restrict ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seven Brothers (islands)
The Seven Brothers Islands, also known as the Sawabi Islands or Seba Islands, is an archipelago in the Dact-el-Mayun section of the Bab-el-Mandeb strait (between the Red Sea and the Gulf of Aden). They are within the Obock District of Djibouti, and are a notable diving site. Even in English publications, the group is often called by its French name, ''Sept Frères''. Geography The archipelago proper is a chain of six volcanic islands spanning about in a rough east-west line:Sailing Directions (Enroute) - Red Sea and Persian Gulf', page 162. National Geospatial Intelligence Agency pub. 172. Accessed 2012-07-6. * West Island, or Red Island (''H̱amra''), 62 m high * Double Island (''Ounḏa Dâbali''), 46 m high * Low Island (''Tolka''), 17 m high * Big Island (''Kaḏḏa Dâbali''), 114 m high * East Island (''H̱orod le ‘Ale''), 83 m high * South Island (''‘Ounḏa Kômaytou''), 47 m high The "seventh brother" is not an island, but the volcanic hill at the northern tip of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rocher Siyyan
Rocher Siyyan is a striking isolated white islet in the middle of the marshy bay to the west of Ras Siyyan peninsula. It is situated off the coast of Djibouti, in the Bab-el-Mandeb strait between the Red Sea and the Gulf of Aden.Sailing Directions (Enroute) - Red Sea and Persian Gulf', page 161. National Geospatial Intelligence Agency pub. 172. Accessed 2012-07-6. The rock belongs to Djibouti's Obock District The Obock Region ( aa, Rakaakay Obock, ar, إقليم أوبوخ, so, Gobolka Obokh) is a region in northern Djibouti. It has a land area of 4,700 square kilometres (1,800 sq mi), and had a population of 37,856 in 2009. It lies along the Red S .... Rocher Siyyan is located about 800 m southwest from the volcanic hill that is the northern tip of Ras Siyyan, and about 1500 m from the mainland's shoreline. It is 55 meters long, up to 45 meters wide, and has an area of barely 2,000 square meters. References Islands of Djibouti {{Djibouti-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shark
Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term "shark" has also been used to refer to all extinct members of Chondrichthyes with a shark-like morphology, such as hybodonts and xenacanths. The oldest modern sharks are known from the Early Jurassic. They range in size from the small dwarf lanternshark (''Etmopterus perryi''), a deep sea species that is only in length, to the whale shark (''Rhincodon typus''), the largest fish in the world, which reaches approximately in length. Sharks are found in all seas and are common to depths up to . They generally do not live in freshwater, although there are a few known exceptions, such as the bull shark and the river shark, which can be found in both seawater and fresh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thalassia (plant)
''Thalassia'' is a marine seagrass genus comprising two known species. Species *''Thalassia hemprichii'' ( Ehrenb.) Asch. - Pacific Turtlegrass (shores of the Western and Central Indo-Pacific) *''Thalassia testudinum'' (Banks ex K.D.König) - Caribbean Turtlegrass (Gulf of Mexico, Caribbean Sea, and Bermuda) References * External links * *Imagesof ''Thalassia'' at Algaebase AlgaeBase is a global species database of information on all groups of algae, both marine and freshwater, as well as sea-grass. History AlgaeBase began in March 1996, founded by Michael Guiry. Text was copied from this source, which is avai ... {{Taxonbar, from=Q596300 Hydrocharitaceae Seagrass Hydrocharitaceae genera Taxa named by Joseph Banks Taxa named by Charles Konig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halodule
''Halodule'' is a genus of plants in the family Cymodoceaceae described as a genus in 1841. It is widespread on tropical and semi-tropical ocean shores of all continents except Europe and Antarctica. Species Hybridization has been reported in the Pacific between ''H. pinifolia'' and ''H. uninervis''.Ito, Y. and Nr. Tanaka (2011Hybridisation in a tropical seagrass genus, ''Halodule'' (Cymodoceaceae), inferred from plastid and nuclear DNA phylogenies. '' Telopea'' 13: 219-231 There are six recognised species: *'' Halodule bermudensis'' - Bermuda *'' Halodule ciliata'' - Panama *'' Halodule emarginata'' - SE Brazil *'' Halodule pinifolia'' - India, Sri Lanka, Southeast Asia, Hainan, Taiwan, Ryukyu Islands, New Guinea, Queensland, Fiji, New Caledonia, Tonga, Caroline Islands *'' Halodule uninervis'' - shores of Indian + Pacific Oceans, Red Sea, Persian Gulf, Bay of Bengal, Papuasia, Queensland, Micronesia *'' Halodule wrightii'' - Atlantic Ocean shores including Caribbean + Gul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avicennia Marina
''Avicennia marina'', commonly known as grey mangrove or white mangrove, is a species of mangrove tree classified in the plant family Acanthaceae (formerly in the Verbenaceae or Avicenniaceae). As with other mangroves, it occurs in the intertidal zones of estuarine areas. Description Grey mangroves grow as a shrub or tree to a height of , or up to in tropical regions. The habit is a gnarled arrangement of multiple branches. It has smooth light-grey bark made up of thin, stiff, brittle flakes. This may be whitish, a characteristic described in the common name. The leaves are thick, long, a bright, glossy green on the upper surface, and silvery-white, or grey, with very small matted hairs on the surface below. As with other ''Avicennia'' species, it has aerial roots (pneumatophores); these grow to a height of about , and a diameter of . These allow the plant to absorb oxygen, which is deficient in its habitat. These roots also anchor the plant during the frequent inundation o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mangrove
A mangrove is a shrub or tree that grows in coastal saline water, saline or brackish water. The term is also used for tropical coastal vegetation consisting of such species. Mangroves are taxonomically diverse, as a result of convergent evolution in several plant families. They occur worldwide in the tropics and subtropics and even some temperate coastal areas, mainly between latitudes 30° N and 30° S, with the greatest mangrove area within 5° of the equator. Mangrove plant families first appeared during the Late Cretaceous to Paleocene epochs, and became widely distributed in part due to the plate tectonics, movement of tectonic plates. The oldest known fossils of Nypa fruticans, mangrove palm date to 75 million years ago. Mangroves are salt-tolerant trees, also called halophytes, and are adapted to live in harsh coastal conditions. They contain a complex salt filtration system and a complex root system to cope with saltwater immersion and wave action. They are ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metre
The metre (British spelling) or meter (American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its prefixed forms are also used relatively frequently. The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately km. In 1799, the metre was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. The current definition was adopted in 1983 and modified slightly in 2002 to clarify that the metre is a measure of proper length. From 1983 until 2019, the metre was formally defined as the length of the path travelled by light in a vacuum in of a second. After the 2019 redefi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 continents. The size of a peninsula can range from tiny to very large. The largest peninsula in the world is the Arabian Peninsula. Peninsulas form due to a variety of causes. Etymology Peninsula derives , which is translated as 'peninsula'. itself was derived , or together, 'almost an island'. The word entered English in the 16th century. Definitions A peninsula is usually defined as a piece of land surrounded on most, but not all sides, but is sometimes instead defined as a piece of land bordered by water on three of its sides. A peninsula may be bordered by more than one body of water, and the body of water does not have to be an ocean or a sea. A piece of land on a very tight river bend or one between two rivers is sometimes s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcano
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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