Kushk River

The Kushk is a river which, during a portion of its course, forms the boundary between Afghanistan and Turkmenistan, and used to form the southernmost border of the Russian Empire and the Soviet Union. The Kushk is fed by the Aq Robat and Galleh Chagar rivers in north-western Afghanistan.

The river gives its name to Kushk, the chief town in the Afghan province of Herat, situated some 20 miles from the border, and to Kushka (now Serhetabat).

Source: Wikipedia