“ The north-east part of the basin consists of a network of basins, which admit of being grouped in four divisions—Särtäng or Serteng, Makhai, Tsädam or Tsaidam, and Kurlyk or Tosun. The characteristic feature of each of these is that which is found in so many of the valleys of the Tibetan borderland, namely, a pair of linked lakes, one containing salt water and the other fresh water. The only inhabitants of Tsaidam are Mongols—Särtang Mongols in the north and Tajinur Mongols in the south. ”