Question

What are known as Duns? Name some well-known Duns.

Answer 1

Hint: These are formed because of the deposits of huge fine grained material from both sides of the Slope. Basically, it refers to a flat surface where a large settlement resides.

Complete Answer:
The longitudinal valleys which lie between lesser Himalaya and the Shivaliks are termed as Duns. Doon or Dun refers to a local word that is used for valley, particularly an open valley in the Siwaliks or between the Siwaliks and higher Himalayan foothills. Other different valleys in this region have names such as Patli Dun, Kotli Dun, Pinjore Dun in Himachal. These kinds of valleys are termed as Inner Terai in Nepal and India.
In general, Duns refer to the longitudinal valleys which are formed as a result of folding when Eurasian plate and Indian plate collide. They are generally formed between Lesser Himalayas and Shiwaliks. These valleys are deposited with coarse alluvium which is brought down by the Himalayan rivers. These valleys could be about 8–10 kms wide and upto 40–50 kilometres long. Dehradun and Pathankot Dun are some well known famous examples.

Note:
The Doon Valley refers to an unusually wide, long valley located generally within the Shivalik Hills in the Lesser Himalayas, in the Indian states of Uttarakhand, Himachal Pradesh and Haryana. Within the valley only lies the city of Dehradun,which is the capital of Uttarakhand state. The Doon Valley lies in between the two intermittent ranges of the great Himalayas, and the Outer Himalayas also called the Shivalik Hills and the Lesser Himalayas, known locally as the Mussoorie Range.