Lake Poopó (Spanish: Lago Poopó Spanish: [ˈlaɣo po.oˈpo]) was a large saline lake in a shallow depression in the Altiplano Mountains in Oruro Department, Bolivia, at an altitude of approximately 3,700 m (12,100 ft).[2][3] Because the lake was long and wide (90 by 32 km, 56 by 20 mi), it made up the eastern half of the department, known as a mining region in southwest Bolivia.