1. The word Atoll comes from Dhievi word atholhu meaning, an administrative subdivision.
2. Fist discovered by Charles Darwin in 1625
3. The largest Atoll is in the indian ocean named Great Chagos Bank
4. Some of these islands have been settled by oceanic peoples like the Maldivians, Polynesians, and Micronesians for many centuries
5. Atolls are formed by sinking volcanic islands
Atolls are the great rings of the ocean