The Himalaya region is dotted with hundreds of lakes. Most lakes are found at altitudes of less than 5,000 m, with the size of the lakes diminishing with altitude. Pangong Tso, which is spread across the border between India and China, and Yamdrok Tso, located in central Tibet, are amongst the largest with surface areas of 700 km², and 638 km², respectively. Other notable lakes include Gurudogmar lake in North Sikkim, Tsongmo lake, near the Indo-China border in Sikkim, and Tilicho lake in Nepal in the Annapurna massif.
The mountain lakes are known to geographers as tarns if they are caused by glacial activity. Tarns are found mostly in the upper reaches of the Himalaya, above 5,500 metres.