The Kushk is a river which, during a portion of its course, forms the boundary between Afghanistan

Afghanistan

Afghanistan , officially the Islamic Republic of Afghanistan, is a landlocked country located in the centre of Asia, forming South Asia, Central Asia and the Middle East. With a population of about 29 million, it has an area of , making it the 42nd most populous and 41st largest nation in the world...

 and Turkmenistan

Turkmenistan

Turkmenistan , formerly also known as Turkmenia is one of the Turkic states in Central Asia. Until 1991, it was a constituent republic of the Soviet Union, the Turkmen Soviet Socialist Republic . Turkmenistan is one of the six independent Turkic states...

, and used to form the southernmost border of the Russian Empire

Russian Empire

The Russian Empire was a state that existed from 1721 until the Russian Revolution of 1917. It was the successor to the Tsardom of Russia and the predecessor of the Soviet Union...

 and the Soviet Union

Soviet Union

The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

. The Kushk is fed by the Aq Robat and Galleh Chagar rivers in North-Western Afghanistanhttp://www.britannica.com/eb/article-9046508.

The river gives its name to Kushk

Kushk

Kushk or Koshk is a town in Afghanistan that shares its name with the Kushk River which flows by the town. It is the center of Kushk District, Herat Province. The population is 17 479. It is located at at 1068 m altitude....

, the chief town in the Afghan

Afghanistan

Afghanistan , officially the Islamic Republic of Afghanistan, is a landlocked country located in the centre of Asia, forming South Asia, Central Asia and the Middle East. With a population of about 29 million, it has an area of , making it the 42nd most populous and 41st largest nation in the world...

 province of Herat

Herat

Herāt is the capital of Herat province in Afghanistan. It is the third largest city of Afghanistan, with a population of about 397,456 as of 2006. It is situated in the valley of the Hari River, which flows from the mountains of central Afghanistan to the Karakum Desert in Turkmenistan...

, situated some 20 miles from the border, and to Kushka

Kushka

Kushka may refer to:*Serhetabat, Turkmenistan*Kushka, Balkh, Afghanistan...

 (now Serhetabat

Serhetabat

Serhetabat is a small town in the Mary Province in Turkmenistan, located in the valley of the Kushka River. Population: 5,200 ....

), a former military post on the border of Turkmenistan.