Explanation:

Tons River

Located in Dehradun and with its source traced back to Bandarpunch Parvat, this river is famed for being the largest tributary of river Yamuna and makes its way through the entire Garhwal region and even touches a little bit of Himachal Pradesh. The exact location of this river lies in the Jaunsar Bawar region and crosses the cant of Chakrata which is located in between the rivers of tons and Yamuna. Various researches done the river have found that it is possible that Saraswati River used to have its source in the Himalayan glacial waters which then due to some tectonic event tons became a tributary of Yamuna.