Coral polyps created the Kwajalein atoll great barrier reef.
The largest coral atoll in the world is Kwajalein, which includes 93 islands and islets and a land area of 1,560 acres. It is encircled by one of the largest lagoons in the world, which is (839 km2) in size.
Over a skeleton made of calcium carbonate, coral polyps create a living carpet. The corals that set the groundwork for and construct the reef structures are largely stony corals. If a fringing reef forms around a volcanic island that sinks completely below sea level while the coral continues to grow upward, an atoll forms.
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