Both lakes are located in the Great Lakes Depression area of western Mongolia, with the Tarvagatai range of the Khangai Mountains immediately to the east. The larger of the lakes, Ulaagchinii Khar Nuur, is freshwater and bordered by sand dunes and local hills to the south. It is 23 km west to east and 5 km north to south, and has a small lake, Baga Lake, to its northwest. 60 km to the west is Bayan Lake. The lakes are at an altitude of about .