Lake Torrens is a large ephemeral, normally endorheic salt lake in central South Australia. After sufficiently extreme rainfall events, the lake flows out through the Pirie-Torrens corridor to the Spencer Gulf. Islands on the lake include Andamooka Island and Murdie Island, both near the western shore; Trimmer Inlet runs between Andamooka Island and the shore, and Carrapateena Arm is an arm extending westwards south of Murdie Island.