Tsongmo or Changu Lake is present in East Sikkim, about 40 km ahead of Gangtok. The beautiful lake is a glacial water body, situated at an altitude of 3,780 m above sea level. One can find this lake on the way to The Nathu La Pass in Sikkim.
Also, the Chinese border crossing is just about 5 km ahead of this pristine lake. There is a speciality about this lake. The Indian Postal Service released a stamp dedicated to this lake in the year 2006.