The city has rich water resources of the Yarlung Zangbo or Tsongpo as it is known in the short form. It is the mother river of Tibet. In addition, 41 other rivers flow through Lhoka. The river flowing from west to east has a river area of and flows for through seven counties namely, Nanggarze, Gonggar, Chahang, Nedong, Sangri, Qusum and Gyacha. In addition, there are 88 lakes of which the important ones are the Yamdrok Lake, the Chigu Lake and the Purmo Yumco lake. The hydroelectric power potential of the river system of Shannan has been assessed at 35.1 million kW. However, the power generated at present is only 18,300 kW.