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Amu Darya, one of the longest rivers of Central Asia. The Amu Darya was traditionally known to the Western world from Greek and Roman times as the Oxus and was called the Jayḥūn by the Arabs. It allegedly derives its present name from the city of Āmul, which is said to have occupied the site of modern Türkmenabat (formerly Chärjew) in Turkmenistan. As well known as it was in antiquity, the river nevertheless received but...