Beas (bēˈäs) [key], river, 250 mi (402 km) long, rising in the Himalayas and flowing generally SW through the fertile Kulu Valley of Himachal Pradesh and the Shiwalik Range to join the Sutlej River, S of Amritsar, N India. One of the "five rivers" of the Punjab, the Beas marked the eastern limit of Alexander the Great's invasion of India in 326 B.C.
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