Tons
Under review: this entry was added recently and its position is still being checked (exact (OSM geometry)).
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Overview
The Tons is the largest tributary of the Yamuna in the Himalaya. It rises near the Bandarpunch massif and flows through Uttarkashi and Dehradun districts of Uttarakhand.
It forms part of the boundary between Uttarakhand and Himachal Pradesh and joins the Yamuna near Kalsi.
It carries more water than the Yamuna at their confluence. The Ichari and Kishau projects use its water.
Geography and key facts
- Largest Himalayan tributary of the Yamuna
- Uttarakhand–Himachal boundary
- Joins the Yamuna near Kalsi
- Kishau multipurpose project
Why it matters for UPSC
Kalsi also has an Ashokan rock edict – a useful history link.
Note for UPSC
The largest Himalayan tributary of the Yamuna, in Uttarakhand.
Prelims asks about tributaries, the states a river flows through, its basin and the projects on it, so trace the course on the map.
Asked in PYQs
No question in our Prelims bank names Tons yet.
Key facts
- Type
- River
- States / UTs on its course
- Uttarakhand, Himachal Pradesh
- River system
- Himalayan
- Basin
- Ganga
- Extent on map
- 30.5°–31.0°N, 77.7°–77.9°E
From the Map Explorer data; positions are for orientation.
In the lessons
- Physical Features and Drainage of India (map lesson)
- Drainage Systems of India: Himalayan and Peninsular Rivers (map lesson)
- The Harappan (Indus Valley) Civilisation (map lesson)
- Harappan Civilisation: Sites, Town Planning and Phases (map lesson)
- Mahajanapadas and the Rise of Magadha (map lesson)