Zanda County or Tsamda County is a county in the Ngari Prefecture to the extreme west of the Tibet Autonomous Region of China. Its seat of power is at Tholing, the former capital of the Guge kingdom.

Ngari Prefecture or Ali Prefecture is a prefecture of China's Tibet Autonomous Region covering Western Tibet, whose traditional name is Ngari Khorsum. Its administrative centre and largest settlement is the town of Shiquanhe. It is one of the least densely populated areas in the world, with 0.3 people per kilometer.