Atoll

An atoll is a type of low, coral island found in tropical oceans and consisting of a coral-algal reef surrounding a central depression. The depression may be part of the emergent island, but more typically is a part of the sea (that is, a lagoon), or very rarely is an enclosed body of fresh, brackish, or highly saline water.

Related Topics:
Coral - Island - Tropical - Ocean - Coral-algal reef - Lagoon - Saline

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