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This is the second biggest coral reef system on Earth, the largest being the Great Barrier Reef. It is approximately one third the size of the 900km long Mesoamerican Barrier Reef System. Benares Shoals: Peros Banhos atoll, northern Chagos Archipelago: Blake Plateau reef
For the atoll to persist, the coral reef must be maintained at the sea surface, with coral growth matching any relative change in sea level (subsidence of the island or rising oceans). [25] On the atolls, an annular reef rim surrounds the lagoon, and may include natural reef channels.
An alternative model for the origin of atolls is called the antecedent karst model. In the antecedent karst model, the first step in the formation of an atoll is the development of a flat top, mound-like coral reef during the subsidence of an oceanic island of either volcanic or nonvolcanic origin below sea level.
Sikaiana (formerly called the Stewart Islands) is a small atoll 212 kilometres (132 miles) northeast of Malaita is almost 14 kilometres (8.7 miles) in length and its lagoon, known as Te Moana, is totally enclosed by the coral reef. Sikaiana is an example of a coral atoll formed from an oceanic volcano, with a coral reef growing around the shore ...
Kingman Reef (/ ˈ k ɪ ŋ m ən /) is a largely submerged, uninhabited, triangle-shaped reef, geologically an atoll, 9.0 nmi (20 km) east-west and 4.5 nmi (8 km) north-south, [2] in the North Pacific Ocean, roughly halfway between the Hawaiian Islands and American Samoa.
The results of Job and Ceccarelli's 2010 survey [20] were published as the Tuvalu Marine Life Scientific Report in 2012. [21] showed that the mean hard coral cover of Funafuti, Nanumea and Nukulaelae were 15%, 11% and 6%, respectively. with Funafuti having a higher mean coral cover, which was attributed to better water flow through the large reef passes (ava) and greater habitat diversity due ...
Each atoll covers an area of around 80 to 90 km 2 (31 to 35 sq mi) within the rim of the reef, including the lagoons, while the land areas are negligible. They belong to Western Australia. They all rise steeply from the surrounding ocean floor. To the northeast lie the Scott and Seringapatam Reefs which are located on the same undersea platform.
Lighthouse Reef is an atoll in the Caribbean Sea, the easternmost part of the Belize Barrier Reef and one of its three atolls, the other two being Turneffe Atoll and Glover's Reef. Lighthouse Reef is located about 80 kilometres (50 mi) southeast of Belize City.