Shiwalik Ranges. The southernmost range of the Himalayas is known as the Shiwaliks or outer Himalayas. Its average height is less than 1000 metres. Although these extend from Kashmir to Arunachal Pradesh, yet these are not continuous ranges. These are made of loose, unconsolidated sediments broguht down by rivers. Soil erosion by chos is at its worst in this region. In between the Shiwaliks and the lesser Himalayas, longitudinal valleys called Duns are found such as Dehradun.
