Beas bē´äs [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 BC

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