Question

The longitudinal valley lying between lesser Himalayas and shiwaliks are known as:
a) Kullu valley
b) Kangra valley
c) Kashmir valley
d) Duns

Answer 1

Hint: A longitudinal valley is an elongated valley found in geologically young folded mountains, such as the Alps, Carpathians, Andes, or the Central Asian highlands, between two near-parallel mountain chains. Three common types of valleys, including u-shaped valleys, v-shaped valleys, and flat-floored valleys.

Complete answer:
- The longitudinal valley is a longitudinal valley, known as 'duns' in the west and 'duars' in the east, between the lesser Himalayas and shiwaliks.
- Unlike typical river valleys, duns have a structural origin, and are filled with boulders and gravel resulting from the erosion of the Himalayas and the Shiwalik uplands. Dehra, Kothri, Chaukham, Patli and Kota are the greatest duns found in the area.
- With over 500 bird species having been reported within the valley and in the surrounding areas, including the Mussoorie Hills and Rajaji National Park, the Doon Valley is ecologically rich, particularly with regard to bird life.
- The reserved forests and community forests in the district, in and around the valley, are also botanically rich in terms of forests (esp. Sal or Shorea robusta, and Teak), flowering and fruiting trees, natural wetlands, and Terai and Bhabar habitats.

Hence, the correct answer is option (d).

Note: 

- There are three parallel ranges in the Himalayas, the Greater Himalayas known as the Himadri, the Lesser Himalayas known as the Himachal, and the hills of Shivalik that form the foothills. At an altitude of Centered on regions from west to east or east to west, the Himalayas have also been split.
- On the basis of the rivers flowing in the Himalayan areas, the division has been achieved. ... Punjab Himalayas: Between the Indus and Sutlej lies this section. They are also known as the Himalaya of Kashmir and the Himalaya of Himachal.8848 m, Mount Everest is the highest mountain, followed at 8598 m by Kanchenjunga.