Question

What is “Doons”?

Answer 1

Hint: Stretching over the northern borders of India lies the majestic Himalayas. In its longitudinal extent, these mountains consist of three parallel ranges. The northernmost range is the Himadri or the Great or Inner Himalayas. To the south of the Himadri, lie the Himachal or lesser Himalayas. Shivalik is known as the outermost range of the Himalayas.

Complete step-by-step solution:
The outermost range of the Himalayas is known as the Shiwaliks. From the main Himalayan ranges, the unconsolidated sediments are brought down by rivers which in turn compose these ranges. These valleys are covered with thick gravel and alluvium and they extend over a width of 10-50 Km and have an altitude varying between 900 and 1100 meters. They are formed when the Eurasian plate and the Indian plate collide as a result of folding. The coarse alluvium brought down by Himalayan Rivers is deposited here.
Doon valley is unusually wide and long in the Indian states of Haryana, Himachal Pradesh, and Uttarakhand. The city of Dehradun, the capital of Uttarakhand, lies within this valley. The longitudinal valley that lies between the lesser Himalayas and the Shiwaliks is referred to as the Doons. It effectively forms a watershed between the Yamuna and the Ganga river systems. This region is ecologically rich, specifically in terms of birdlife, with over 500 recorded species within the valley and surrounding areas too.

Note: The Himalayas have been divided on the basis of regions from west to east, not only by the longitudinal divisions; but these divisions have been demarcated by river valleys also.