Atoll

An atoll ( /ˈætɒl, ˈætɔːl, ˈætoʊl, əˈtɒl, əˈtɔːl, əˈtoʊl/), sometimes known as a coral atoll, is a ring-shaped coral reef, including a coral rim that encircles a lagoon partially or completely. There may be coral islands or cays on the rim.

Atoll

An atoll ( /ˈætɒl, ˈætɔːl, ˈætoʊl, əˈtɒl, əˈtɔːl, əˈtoʊl/), sometimes known as a coral atoll, is a ring-shaped coral reef, including a coral rim that encircles a lagoon partially or completely. There may be coral islands or cays on the rim.