Hindu Rush (Hindoo Koosh; anc.' Indian Caucasus '), the westward continuation of the Himalayan system, from which it is separated by the chasm through which the Indus breaks its way to the plains. It strikes off from the south-west angle of the Pamir plateau, and extends 365 miles westward to the Bamian valley in Afghanistan, separating that country on the south from Turkestan on the north. Near its point of origin several rivers take their birth ; the Oxus goes off northwest through Turkestan, and the Helmund southwest through Afghanistan. The main range breaks into four subsidiary ridges, and has a total width of about 200 miles. Unlike the Himalayas, it sinks suddenly to the plains of Turkestan on the north. It is crossed by several passes, 12,000 or 13,000 feet high. From the Bamian valley the range is continued westwards as a low watershed elevation, known as Koh-i-Baba. (Koh-i-Baba is also the name of a peak in the Hindu Kush.) The peak of Hindu Koh, 80 miles N. of Kabul, rises more than 20,000 feet above the sea. The highest point ex-ceeds 23,000. Minerals, especially iron, occur in great abundance. The inhabitants consist principally of Dards and Shins. A loose kind of Mohammedanism is the prevalent form of religion. See Biddulph, Tribes of Hindu Kush (Calcutta, 1880).