+An atoll is a ring-shaped [coral reef](/wiki/Coral_Reef) or chain of islands, often enclosing a central [lagoon](/wiki/Lagoon). These unique landforms typically develop from volcanic islands that slowly subside beneath the ocean's surface.
+## See also
+- [Island](/wiki/Island)
+- [Reef](/wiki/Reef)
+- [Volcano](/wiki/Volcano)
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