Tsongmo Lake or Changu Lake is a glacial lake in the East Sikkim, India.
It is literally known as "source of the lake" in Bhutia language. Just about 40 KMs away from Gangtok, this serene lake is situated at an altitude of 12,000 ft on the Gangtok Nathu-La highway.
The lake is about 1 km. Long, oval in shape, 15 meters deep and is considered sacred by the local people. It is also a home of brahminy ducks. It's cool, placid water harmonizes with the scenic beauty around.
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