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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 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 ...
Maro Reef (Hawaiian: Nalukākala - "surf that arrives in combers ") is a largely submerged coral atoll located in the Northwestern Hawaiian Islands. It was discovered in 1820 by Captain Joseph Allen of the ship Maro, after whose ship the reef was named. With a total area of 747 square miles (1,935 km 2), it is the largest coral reef in the ...
Bikini Atoll (/ ˈ b ɪ k ɪ ˌ n iː / or / b ɪ ˈ k iː n i /; Marshallese: Pikinni, [pʲiɡinnʲi], lit. ' coconut place '), [2] known as Eschscholtz Atoll between the 19th century and 1946, [3] is a coral reef in the Marshall Islands consisting of 23 islands surrounding a 229.4-square-mile (594.1 km 2) central lagoon.
The atoll is the largest raised coral reef in the world with an elevation of 8 metres (26 ft); and the second-largest atoll in the world after Kiritimati Atoll. [18] It lies at 9°24′S 46°22′E / 9.400°S 46.367°E / -9.400; 46.367 and belongs to the Aldabra Group , one of the island groups of the Outer Islands of the Seychelles ...
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.
Palmyra Atoll (/ pælˈmaɪrə /), also referred to as Palmyra Island, is one of the Northern Line Islands (southeast of Kingman Reef and north of Kiribati). It is located almost due south of the Hawaiian Islands, roughly one-third of the way between Hawaii and American Samoa. North America is about 3,300 miles (5,300 kilometers) northeast and ...
The Tubbataha Natural Park, also known as the Tubbataha Reefs Natural Park (Filipino: Bahurang Tubbataha), is a protected area of the Philippines located in the middle of the Sulu Sea. The marine and bird sanctuary consists of two huge atolls (named the North Atoll and South Atoll) and the smaller Jessie Beazley Reef covering a total area of ...