Changu – Lake + Baba Mandir Tour , evening leisure time . O/N gangtok Tsomgo (Changu) lake East Sikkim Tsomgo literally means "source of the lake " in Bhutia language. 'TSO' means lake and ' MGO' means head .At about 40 kms . away from Gangtok, this serene and holy lake is situated at an altiude of 12,000 ft on the Gangtoknathu highway . It is also a home of brahmini ducks besides being a stopover for varius migratory birds .