---
title: "Duns: Himalayan Valleys (UPSC GS1 Geography)"
description: "Duns are flat-floored valleys between the Lesser Himalaya and Shiwalik ranges, crucial for UPSC aspirants studying Indian physiography."
url: "https://modeldiplomat.com/learn/glossary/duns-valleys"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- Duns are longitudinal valleys formed between the Lesser Himalaya and the Shiwalik (Outer Himalaya) ranges by the deposition of coarse alluvium.
- How are Duns formed?
- What is the difference between a Dun and a Karewa?
- How do Duns differ from the Bhabar and Tarai belts?
- Why are Duns significant for settlement and administration?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

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Dehra Dun, the capital of Uttarakhand established as a state capital in 2000, occupies the largest Dun valley, lying between the Ganga and Yamuna rivers in the trough separating the Shiwaliks from the Lesser Himalaya.

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