Amu Dar'ya

geographical name

Amu Dar'·​ya ˌä-mü-ˈdär-yə 

variants or ancient Oxus

ˈäk-səs 

river over 1500 miles (2400 kilometers) long in central and western Asia flowing from the Pamirs into the Aral Sea

Note: Reduced flow of the Amu Darya in the latter part of its course, mainly due to the siphoning off of water for irrigation, has been a contributing factor in the severe shrinkage of the Aral Sea.