Lake Towuti  Lake Towuti () is a lake in South Sulawesi, Indonesia. It is located at . Surrounded by mountains, it is the largest lake of the island of Sulawesi and one of the five lakes of the Malili Lake system (the other being Matano, and the small Mahalona, Masapi and Lontoa (Wawantoa)). A river flows from the lake to the Boni Bay. The town Laronda is located on its shore. Together with the other lakes in the Malili Lake system, Towuti has a large number of endemic fishes (Telmatherinid sail-fin silversides, "Glossogobius" and "Mugilogobius" gobies, "Nomorhamphus" halfbeaks and "Oryzias" ricefishes), "Caridina" shrimps, Parathelphusid crabs ("Nautilothelphusa", "Parathelphusa" and "Syntripsa") and "Tylomelania" snails. Among these, "Caridina spongicola" lives on freshwater sponges, making it one of only two known commensal species of freshwater shrimp (the other is a "Limnocaridina" shrimp that lives in mussels in Lake Tanganyika, East Africa).