Atoll remains of an ancient atoll as a hill in a limestone area is called a reef knoll. The second largest atoll by dry land area is Aldabra with 155 km². The largest atoll in terms of island numbers is Huvadhu Atoll in the south of the Maldives with 255 islands. In 1842, Charles Darwin explained the creation of coral atolls in the southern Pacific Ocean based upon observations made during a five-year voyage aboard from 1831 to 1836. Accepted as basically correct, his explanation involved considering that several tropical island types—from high volcanic island, through barrier reef island, to atoll—represented
Feevah (Shaviyani Atoll) country's capital, Malé. Feevah (Shaviyani Atoll) Feevah (Dhivehi: ފީވައް) is one of the inhabited islands of Shaviyani Atoll administrative and geographically part of the Miladhummadulhu Atoll in the Maldives. The island has had its fair share of natural disasters. Feevah was the southernmost island which was affected by the August 1815 earthquakes that shook the northernmost islands of the Maldives. The island was later severely damaged by the great cyclone of 1821. In modern history, the Boxing Day Tsunami of 2004 damaged the island and has affected agriculture on the island- the main occupation of its inhabitants. The island is