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The atoll of Tetiʻaroa in French Polynesia. An atoll (/ ˈ æ t. ɒ l,-ɔː l,-oʊ l, ə ˈ t ɒ l,-ˈ t ɔː l,-ˈ t oʊ l /) [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] Atolls are located in warm tropical or subtropical parts of the oceans and seas where ...
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.
Some islands are formed when coral reefs grow on volcanic islands that have submerged beneath the surface. [12] When these coral islands encircle a central lagoon, the island is known as an atoll. [13] The formation of reefs and islands related to those reefs is aided by the buildup of sediment in shallow patches of water.
The atoll has some 20 mi (32 km) of roads, 4.8 mi (7.7 km) of pipelines, one port on Sand Island (World Port Index Nr. 56328, MIDWAY ISLAND), and an airfield. As of 2004, [update] Henderson Field airfield at Midway Atoll, with its one active runway (rwy 06/24, around 8,000 ft (2,400 m) long) has been designated as an emergency diversion airport ...
Johnston Atoll is located between the Marshall Islands and the Hawaiian Islands. Johnston Atoll is a 1,300-hectare (3,200-acre) atoll in the North Pacific Ocean, located about 750 nautical miles (1,390 km; 860 mi) southwest of the island of Hawaiʻi, and is grouped as one of the United States Minor Outlying Islands. [11]
Utirik Atoll or Utrik Atoll (Marshallese: Utrōk, [wudˠ(ɯ)rˠɤk] [1]) is a coral atoll of 10 islands in the Pacific Ocean, and forms a legislative district of the Ratak Chain of the Marshall Islands. Its total land area is only 2.4 square kilometers (0.94 sq mi), but it encloses a lagoon with an area of 57.7 square kilometers (22.29 sq mi).
Pikelot Atoll is an uninhabited coral island about 415 miles southeast of Guam that is occasionally visited by fishing boats. An expedition of Micronesian sailors found an abandoned makeshift ...
Rangiroa (Tuamotuan for 'vast sky') or Te Kokōta (Cook Islands Māori for 'the Hyades star cluster') is the largest atoll in the Tuamotus and one of the largest in the world (smaller than Kwajalein in the Marshall Islands and Huvadhu in the Maldives).