Importance of shiwalik range
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shiwalik is the outermost range of the Himalayas.
→ They extend over a width of 10-50 Km and have a height varying between 900 and 1100 metres.
→ It is composed of unconsolidated sediments brought down by rivers from the main Himalayan ranges.
→ These valleys are covered with thick gravel and alluvium.
• The longitudinal valley lying between lesser Himalaya and the Shiwaliks are known as Duns.
→ Dehra Dun, Kotli Dun and Patli Dun are some of the well-known Duns.
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