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
Fulidhoo (Vaavu Atoll) Fulidhoo (Vaavu Atoll) Fulidhoo (Dhivehi:ފުލިދޫ) is the most northern of the inhabited islands of Vaavu Atoll in the Maldives. It is famous for Maldivian cultural events like Langiri, a traditional dance with drums and Thaara. Fulidhoo is one of the islands of the Vaavu Atoll. Located in the Laccadive Sea, the island is south of the country's capital, Malé. The land area of the island is in 2018, up from in 2007. The island has a large lagoon, which is used as a natural harbour. In 2012, Fulidhoo had two fishing vessels. The majority of the catch was of fish