30 Kms beyond Lachen lies Thangu at an altitude of 13000ft. Months of may and June see this valley carpeted of alpine flowers which are replaced by snow from October up to March. The small picturesque hamlet with scanty population Thangu has recently developed few accommodations with basic facilities. Tree lines disappear at Thangu and start a zone that can be compared only with the unreachable terrain in Tibetan plateau. Situated on the high alpine plateau, Thangu can be an ideal place for the real nature lovers as it provides a base for fabulous trek routes to Chopta valley and Muguthang, a land of the nomadic people. One needs to stay at Thangu for acclimatization before proceeding further.
Yumesamdong of North Sikkim is posited at an altitude of 15,300 feet above sea level. It is about 26 kilometers from Yumthang, another famous place in North Sikkim. It takes almost an hour drive to reach Yumesamdong from Yumthang. This drive is as scintillating as the place itself. The drive through the serpentine mountainous amidst the rugged terrain of Sikkim is a life-time experience. Since the place is in close vicinity to the international border between India and China, a special permit is required to visit Yumesamdong.
Guru Dongmar Lake
The lake is named after Guru Padmasambhava - who had brought Tantric Buddhism to Tibet. According to a legend, the lake used to remain frozen all the time. When the Guru Padmasambhava passed by, the local residents approached him for providing source of water in the area. The Guru obliged, a portion of the lake touched by him does not freeze in the extreme winter. Since water of the lake is considered sacred, visitors carry the "holy" water in the bottles.