Atoll Atoll An atoll (, , , , or ), sometimes called a coral atoll, is a ring-shaped coral reef including a coral rim that encircles a lagoon partially or completely. There may be coral islands or cays on the rim. The coral of the atoll often sits atop the rim of an extinct seamount or volcano which has eroded or subsided partially beneath the water. The lagoon forms over the volcanic crater or caldera while the higher rim remains above water(s) or at shallow depths that permit the coral to grow and form the reefs. For the atoll to persist,
Kaafu Atoll part of the administrative division of Kaafu Atoll. The two Malé Atolls are North Malé Atoll and South Malé Atoll which are separated by the Vaadhoo Kandu. Malé and Thulusdhoo are both located in North Malé Atoll. The Malé or Kaafu Atoll administrative division consists of the geographic or natural atolls of North Malé Atoll, South Malé Atoll, Gaafaru Atoll and Kaashidhoo Island. The atolls consists of Inhabited Islands and Uninhabited Island, a definition which includes resort islands, airport islands and industrial islands. Although Malé, Hulhulé, Hulhumalé and Villingili are geographically part of North Malé Atoll, they are not part