Atoll
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An atoll is a ring-shaped island, including a coral rim that encircles a lagoon. There may be coral islands or cays on the rim. Atolls are located in warm tropical or subtropical parts of the oceans a
The atoll of Tetiʻaroa in French Polynesia
Penrhyn atoll
Nukuoro from space. Courtesy NASA
View of the coast of Bikini Atoll from above
Cay
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A cay, also spelled caye or key, is a small, low-elevation, sandy island on the surface of a coral reef. Cays occur in tropical environments throughout the Pacific, Atlantic, and Indian oceans, includ
Atoll
…An atoll () is a ring-shaped island, including a coral rim that encircles a lagoon. There may be coral islands or cays on the rim. Atolls are located in warm tropical or subtropical parts of the oceans and seas where corals can develop. Most of the approximately 440…
Heron Island, Australia
Cay sand under an optical microscope
Warraber Island, Torres Strait
FFS Table bottom