Carle Thulka, also known as Lake Maurice, officially Carle Thulka / Lake Maurice is a salt lake in South Australia. It is the largest of many salt lakes in the eastern end of the Great Victoria Desert. It is normally dry, except during and after periods of heavy rainfall. When it is full, the lake covers an area of around 2,900 hectares (29 km2). It is part of the geological basin known as the Officer Basin. The smaller Lake Dey Dey is to the north. Since 1985, Carle Thulka is part of the lands belonging to the Maralinga Tjarutja, a southern branch of the Pitjantjatjara. The community of Oak Valley is near the western shore of the lake.