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Zigetangcuo Lake ( zh, 兹格塘错) is a crenogenic 
meromictic lake
A meromictic lake is a lake which has layers of water that do not intermix. In ordinary, holomictic lakes, at least once each year, there is a physical mixing of the surface and the deep waters.
The term ''meromictic'' was coined by the Austri ...
in the North Tibetan Plateau
The Tibetan Plateau (, also known as the Qinghai–Tibet Plateau or the Qing–Zang Plateau () or as the Himalayan Plateau in India, is a vast elevated plateau located at the intersection of Central, South and East Asia covering most of the Ti ...
. It is located in Nagqu Prefecture, north of Dongqiao. It has an area of 187 square kilometers at an altitude of 4560 meters. It is the meromictic lake with the highest known altitude.
References
Lakes of Tibet Nagqu Meromictic lakes {{Nagqu-geo-stub