terms of land area. It is also a raised coral atoll (321 km2 land area; according to other sources even 575 km2), 160 km2 main lagoon, 168 km2 other lagoons (according to other sources 319 km2 total lagoon size).

The geological formation known as a reef knoll refers to the elevated remains of an ancient atoll within a limestone region, appearing as a hill. The second largest atoll by dry land area is Aldabra, with 155 km2. Huvadhu Atoll,