The Tons is the largest tributary of the Yamuna and flows through Garhwal

Garhwal Division

Garhwal is the north-western region and administrative division of the northern Indian state of Uttarakhand which is home to the Garhwali people. Lying in the Himalayas, It is bounded on the north by Tibet, on the east by Kumaon region, on the south by Uttar Pradesh state, and on the north-west by...

 region in Uttarakhand

Uttarakhand

Uttarakhand , formerly Uttaranchal, is a state in the northern part of India. It is often referred to as the Land of Gods due to the many holy Hindu temples and cities found throughout the state, some of which are among Hinduism's most spiritual and auspicious places of pilgrimage and worship...

, touching Himachal Pradesh

Himachal Pradesh

Himachal Pradesh is a state in Northern India. It is spread over , and is bordered by the Indian states of Jammu and Kashmir on the north, Punjab on the west and south-west, Haryana and Uttar Pradesh on the south, Uttarakhand on the south-east and by the Tibet Autonomous Region on the east...

. The Tons thrust is named after this river.

Its source lies in the 20,720 ft (6,315 meters)) high Bandarpunch

Bandarpunch

Bandarpunch is a major peak of the Garhwal division of the Himalayas, in the Indian state of Uttaranchal. It literally means "Tail of the monkey" or "Tail of Hanuman" in Hindi. It's a twin peak: Bandarpunch-I & Bandarpunch-II...

 mountain, and is one of the most major perennial Indian Himalayan rivers. In fact, it carries more water than the Yamuna itself, which its meets below Kalsi near Dehradun

Dehradun

- Geography :The Dehradun district has various types of physical geography from Himalayan mountains to Plains. Raiwala is the lowest point at 315 meters above sea level, and the highest points are within the Tiuni hills, rising to 3700 m above sea level...

, Uttarakhand .

Tons valley

Tons valley lies in Jaunsar Bawar

Jaunsar bawar

Jaunsar-Bawar is a hilly region, 85 km from Mussoorie, in Chakrata tehsil, in Dehradun district, it represents the geographical region inhabited by the 'Jaunsari' tribe, which traces its origin from the Pandavas of Mahabharata....

 region, as it emerges from the Himalayas has Dehradun on its eastern bank. In this phase, it passes the Cantonment, the Forest Research Institute

Forest Research Institute

The Forest Research Institute is an institute of the Indian Council of Forestry Research and Education and is a premier institution in the field of forestry research in India. It is located at Dehradun in Uttarakhand. It was established in 1906 and is one of the oldest institutions of its kind...

 Campus and the Indian Military Academy

Indian Military Academy

The Indian Military Academy, Dehradun is the officer training school of the Indian Army. IMA was established in 1932.-Demands for an Indian military training academy:...

 Campus on its western banks. Toward the southern tip of IMA, near Premnagar the river starts to emerge from its valley. The cantonment town of Chakrata

Chakrata

Chakrata or Chakrauta is a cantonment town in Dehradun district in the state of Uttarakhand, India.It is situated between the Tons and Yamuna rivers, at an elevation of 7000–7250 feet, 92 km from state capital, Dehradun, it was originally a cantonment of British Indian Army...

 is situated between, the Tons and Yamuna

Yamuna

The Yamuna is the largest tributary river of the Ganges in northern India...

 rivers.

Tributaries

The Pabbar River is a tributary of the Tones River connecting to it from the west. The Pabbar River is the westernmost river that drains east to the Ganges. The Sutlej River is the next watershed over and is the easternmost river that drains west into the Indus.

Geology

The top of the Tons river is in the Himalayan Crystalline complex. It then flows through Tethan Himalaya rocks before connecting to the Pabbar River in the Lesser Himalayan Sequence. The Tons flows into the Yamuna River after crossing into the Sub-Himalaya Sequence.

Adventure sports

Along with Ganges, it has now become a major destination for water-based adventure sports like white-water rafting in Uttarakhand.You can stay at Jaunsar Bawar region on the banks of the Tons river and enjoy the grade 4 rafting .Typical season for rafting in Tons is till July.