An atoll is a ring of coral that originally grew completely around the shoreline of an island, and which continued to grow upward on top of itself as the island subsided or eroded away. As reef building corals thrive only in warm waters, atolls are only found in the tropics and subtropics.
http://www.touropia.com/captivating-atolls-in-the-world/
http://www.touropia.com/captivating-atolls-in-the-world/
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