Duns are longitudinal valley lying between lesser Himalaya and the Shiwaliks. Some important duns located in this region are the Chandigarh- Kalka dun, Nalagarh dun, Dehra Dun, Harike dun and the Kota dun, etc. Dehra Dun is the largest of all the duns with an approximate length of 35-45 km and a width of 22-25 km.
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