sentences:  It is fed by the rivers Za'gya Zangbo (or Tsagya Tsangpo) (扎加藏布) and the Boques Tsangpo (波曲藏布).With an area of 1865 square kilometers, Siling Co is the second largest saltwater lake in the northern Tibetan Plateau and forms part of the Siling Co National Nature Reserve (also Selincuo Reserve or Xainza Nature Reserve).The 400,000 hectare reserve was established in 1993 and contains significant populations of black-necked cranes and some 120 species of birds in total.