Tsomgo Lake, also known as Tsongmo Lake or Changgu Lake, is a glacial lake in the East Sikkim district of the Indian state of Sikkim, some 40 kilometers from Gangtok. Located at an elevation of 3,753 m (12,313 ft), the lake remains frozen during the winter season.

The lake surface reflects different colors with changes of seasons and is held in great reverence by the local Sikkimese people. Buddhist monks prognosticated after studying the changing colors of the lake.   The lake is surrounded by steep mountains which are covered with snow during winter. During summer the snow cover melts and forms the source for the lake.

Visiting this place was like a litmus test for our group of 4 families that venture on the trip to Sikkim, to see how many would handle high-altitude environments coupled with cold weather.   The short cable car ride via ropeway which took us to the upper station perched at 14,500 feet offered a panoramic view of the surrounding snow peaks and the lake below.