Tsomgo Lake, also known as Tsongmo Lake or Changu Lake, is a glacial lake in the East Sikkim district of the Indian state of Sikkim, some 40 kilometres (25 mi) from the capital 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 colours with change of seasons and is held in great reverence by the local Sikkimese people. Buddhist monks prognosticated after studying the changing colours of the lake.After the winter season ends in middle of May, the periphery of lake has scenic blooms of flower species of rhododendrons (the state tree of Sikkim), primulas, blue and yellow poppies, irises and so forth. Also seen in the precincts of the lake are several species of birds including Brahminy ducks. Wildlife seen includes the red panda.
Tourist attractions at the lake site include joy rides on decorated yaks and mules where kiosks offer variety of food and drinks. There is also a small Shiva temple on the bank of the lake. As the lake is located in a restricted area it is essential for all Indians visiting the area to obtain permits. In case of foreign nationals special permit is essential.
This is one of the few and awesome high altitude lakes in India. The lake becomes doubly attractive with the reflections of the surrounding hills on the water. From Gangtok which is at 5410 ft, the altitude rises to about 10,000 ft in just 15kms. You can imagine how steep the gradient would be on this stretch of the road.