The Kushk (known in Turkmenistan as Guşgy) is a river which, for a portion of its course, forms the boundary between Afghanistan and Turkmenistan, and used to form part of 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.

[4] The river gives its name to Kushk,[citation needed] the chief town in the Afghan province of Herat, situated some 32 kilometres (20 mi) from the Turkmenistan border, and to Kushka (now Serhetabat), a former military post on the border of Turkmenistan.

For about 16 km of its path, the Kushk river marks the border between Afghanistan and Turkmenistan.

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