Salar de Carcote, also known as Salar de San Martín, is a salt flat in northern Chile. The salar is located southwest of Ollagüe. It covers an area of around 108 km² and its surface elevation is 3,690 m. The landscape of the area is dominated by the volcanoes Ollagüe to the east and Aucanquilcha to the north. Salar de Carcote basin is bordered by the Loa River basin to the west and the Salar de Ascotán basin to the south.