Gurudongmar is a high altitude lake close to Tibet boarder in North Sikkim. It is the land of Yaks, blue ships and other high altitude animals of Sikkim and Tibet. The snow-fed milky water of the lake is one of the major sources of Tista, the most important river in Sikkim and North Bengal.

Gurudongmar is one of the highest lakes in the world, located at an altitude of 17,800 ft (5,430 m) in the Indian state of Sikkim. It is a lake which is considered sacred by both Buddhists and Sikhs.[2] The lake is named after Guru Padmasambhava, also known as Guru Rinpoche, founder of Tibetan Buddhism who visited the lake in the 8th century.

The lake is not only blessed by Guru Padmasambava but also by Guru Nanak, the spiritual leader of Sikhism while he had passed through this area, and hence regarded as sacred.

At an attitude of 17000 ft, Gurudongmar is one of the highest lakes in the world. It lies in the North side of the Khangchengyao Range and is encircled all around by snow-covered mountains, the sacred lake freezes during the winters except at one spot, which the devout believe has been specially blessed. The Chinese Tibetan boarder is just a few kilometres away from the lake. The blessed water of the lake is believed to posses the miraculous power of granting children to issueless couples. Interestingly, the myth of Gurudongmar is believed as reverentially by the Hindus as by the local Buddhists. The name Gurudongmar is derived from the name of the Guru Padmasambhava who is thought to have visited Tibet through this area. The area is said to be blessed by Guru Padmasambhava. There is a temple of the Guru besides the lake. Devotee tourists as well as the Army personnel offer prayer at the temple.