Pangong Tso (or Pangong Lake; Tso: Ladakhi for lake) is an endorheic lake in the Himalayas situated at a height of about 4250m (13900ft). It is 134km (83mi) long and extends from India to China. Two thirds of the length of the lake lies in China. The lake is 5km (3.1mi) wide at its broadest point. During winter, the lake freezes completely, despite being saline water.

The lake is in the process of being identified under the Ramsar Convention as a wetland of international importance. This will be the first trans-boundary wetland in South Asia under the convention.