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The largest coral atoll in the world is the Kwajalein Atoll.
The largest atoll in land area is Christmas Island.

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What is a coral atoll?

A coral atoll is a ring-shaped coral reef or island found in warm, tropical oceans. They are formed from the accumulation of coral skeletons on the rims of submerged volcanic islands over thousands of years. Atolls typically enclose a lagoon in their center.


What is at the center of an atoll?

At the center of an atoll is usually a lagoon, which is a body of water surrounded by a ring of coral reef. The lagoon can vary in size and depth depending on the specific atoll.


What is a grouping of coral islands called?

A grouping of coral islands is called an atoll. Atolls are formed from coral reefs that have grown on the remnants of volcanic islands that have sunk in the ocean. They usually form a ring shape with a lagoon in the center.


What do you call a group of islands?

An Atoll is the name used to refer to a group of related coral islands.


What is is the difference between an island and an atoll?

An atoll is formed from an island, but it isn't entirely an island. It's a coral reef that makes the different. The reef grows in a ring around the island and the island erodes, until little if any of it is above the surface of the water and the coral reef remains. Islands are any small body of land surrounded by water. Islands in the middle of the ocean are usually volcanic and islands in lakes and near continents are usually just areas of the continental shelf surrounding the continent with a higher elevation. To actually answer your question, the KEY difference is the reef.