"TGN:21472"^^ . "Wikipedia:Atoll"^^ . "An oceanic island, often having a characteristic ring-like shape surrounding a lagoon. Atolls are formed when coral reef grows around a volcanic island that later subsides into the ocean."^^ . "reef"^^ . "REEF, ISLAND"^^ . . "ENVO"^^ . "coral atoll"^^ . "atoll"^^ . "atoll"^^ . "atoll"^^ . "ENVO:00000166"^^ . "EcoLexicon:atoll"^^ . "SWEETRealm:Atoll"^^ . "island"^^ . "FTT:127"^^ . "Geonames:T.ATOL"^^ . . "FTT:450"^^ .