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The Sivalik Hills is a mountain range of the outer Himalayas also known as Manak Parbat in ancient times. Shivalik literally means 'tresses of Shiva’.This range is about 2,400 km (1,500 m) long enclosing an area that starts almost from the Indus and ends close to the Brahmaputra, with a gap of about 90 kilometres (56 m) between the Teesta and Raidak rivers in Assam. The width of the Sivalik Hills varies from 10 to 50 km (6.2 to 31.1 m), their average elevation is 1,500 to 2,000 m (4,900 to 6,600 ft).It is known as outer range due to its position among the three Himalayan mountain ranges.