t2india.com
t2india.com
Description:
The most famous site nearby is the Gaumukh (literal meaning, cow's mouth) glacier, which is at an altitude of 4200 meters above sea level. It is the geographical origin of the Ganga and is at a distance of 18 km from Gangotri uphill. The 18 km trek is a tedious one and the people go there on foot or on ponies. The snout is held in high esteem by the pilgrims and they do not loose an opportunity to take a dip in the sacred waters.
Gangotri Travel Guide