Lake Poso (Indonesian: Danau Poso) is a lake in Central Sulawesi, Indonesia, and the third-deepest lake in Indonesia. The lake contains various fish, including the eel Anguilla marmorata which migrates between the lake and the sea, and 11 fish species that are endemic to the lake, notably Adrianichthys, Mugilogobius sarasinorum, Nomorhamphus celebensis, Oryzias nebulosus, O. nigrimas, O. orthognathus and Weberogobius amadi, which are all highly threatened (in some cases possibly already extinct). There is also a large number of endemic Tylomelania freshwater snails in the lake, as well as several endemic Caridina shrimps and Parathelphusid crabs (genera Migmathelphusa, Parathelphusa and Sundathelphusa).