An atoll is a ring-shaped coral reef, island, or series of islets that encircle a lagoon partially or completely. Atolls typically form around the rim of submerged volcanoes and are characterized by their shallow waters and diverse marine ecosystems. They are found in tropical and subtropical regions, often providing important habitats for various marine species and serving as critical areas for biodiversity.
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Makin Attol, Guadacanal, Pelilulu, Tarawal, Iwo Jima, Okinawa
as a volcanic island moves further away from its hot spot it is worn down by the weather.it can also slowly sink.
A large area sunken land shaped like a bowl is called a basin. Basins are formed through geological processes such as subsidence or erosion, creating a depression surrounded by higher terrain. These features can hold water and often have important ecological or geological significance.