ancient Oxus River
River, Central Asia.
It is one of the longest rivers in Central Asia, 1,578 mi (2,540 km) long measured from the remotest sources of the Panj River; its other headstream is the Vakhsh. It flows west-northwest to its mouth on the Aral Sea . It forms part of Afghanistan's borders with Tajikistan, Uzbekistan, and Turkmenistan and part of Uzbekistan's border with Turkmenistan.