Pangong Tso is one of the highest salt water lakes in the world, but although saline it still freezes in winter. Situated at a height of about 4,350 m, it covers 604 km²  and is 134 km  long and 5 km at its widest point. Lake is sensitive disputed territory. The Line of Actual Control, between India and China, cuts through the lake near Khurnak Fort but neither county agrees as to where it should be. About a third of the lake lies within India, while the rest is in China-dominated Tibet. There are ongoing confrontations between the 2 countries.

Amazing setting, with isolated villages as well. Details of my visit are available here