atoll

A coral island or series of coral islands forming a ring that nearly or entirely encloses a shallow lagoon. Atolls are surrounded by deep ocean water and range in diameter from about 1 km (0.62 mi) to over 100 km (62 mi). They are especially common in the western and central Pacific Ocean and serve as important habitats for corals, algae and fishes.

Citation: 
Modified from atoll. (n.d.) The American Heritage® Science Dictionary. (2005). Retrieved August 26 2014 from http://www.thefreedictionary.com/atollhttp://www.thefreedictionary.com/atoll.
English

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