From Openwaterpedia

noun - A cay, also spelled caye or key, is a small, low-elevation, sandy island formed on the surface of a coral reef. Cays occur in tropical environments throughout the Pacific Ocean, Atlantic Ocean, and Indian Ocean (including in the Caribbean Sea and on the Great Barrier Reef and Belize Barrier Reef), where they can provide habitable and agricultural land for hundreds of thousands of people. Their surrounding reef ecosystems also provide food and building materials for island inhabitants.

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