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An atoll (/ ˈæt.ɒl, - ɔːl, - oʊl, əˈtɒl, - ˈtɔːl, - ˈtoʊl /) [1] is a ring-shaped island, including a coral rim that encircles a lagoon. There may be coral islands or cays on the rim. [2][3]: 60 Atolls are located in warm tropical or subtropical parts of the oceans and seas where corals can develop. Most of the approximately 440 ...
A raised coral atoll or uplifted coral atoll is an atoll that has been lifted high enough above sea level by tectonic forces, protecting it from scouring by storms and enabling soils and diverse – often endemic – species of flora and fauna to develop. [1] With the exception of Aldabra Island in the Indian Ocean and Henderson Island in the ...
A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. [1] Most coral reefs are built from stony corals, whose polyps cluster in groups. Coral belongs to the class Anthozoa in the animal phylum Cnidaria, which includes sea anemones and ...
Kure Atoll (/ ˈkʊəriː /; Hawaiian: Hōlanikū, lit. 'bringing forth heaven'; Mokupāpapa, 'flat island') [1] or Ocean Island is an atoll in the Pacific Ocean 48 nautical miles (89 km; 55 mi) west-northwest of Midway Atoll in the Northwestern Hawaiian Islands at 28°25′N 178°20′W. A coral ring 6 miles (9.7 km) across encloses a lagoon ...
Canton Island typifies the isolated coral atolls dotting the Pacific Ocean. The Structure and Distribution of Coral Reefs, Being the first part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836, was published in 1842 as Charles Darwin's first monograph, and set out his theory of the formation of coral reefs and atolls.
Aldabra, the world's second-largest coral atoll [2] (the largest is Kiritimati), is located southeast of the continent of Africa.It is part of the Aldabra Group of islands in the Indian Ocean that are part of the Outer Islands of the Seychelles, with a distance of 1,120 km (700 mi) southwest of the capital, Victoria on Mahé Island.
Turneffe Atoll is located southeast of Ambergris Caye and Caye Caulker, off the coast of Belize in Central America, 20 miles (32 kilometres) from Belize City. It is one of three atolls of the Belize Barrier Reef, along with Glover's Reef and Lighthouse Reef. It is approximately 30 miles (48 kilometres) long and 10 miles (16 kilometres) wide ...
Ebon Atoll (Marshallese: Epoon, [ɛbʲɔːnʲ] [1]) is a coral atoll of 22 islands in the Pacific Ocean, forming a legislative district of the Ralik Chain of the Marshall Islands. Its land area is 5.75 square kilometers (2.22 sq mi), and it encloses a deep lagoon with an area of 104 square kilometers (40 sq mi). A winding passage, the Ebon ...