Qarqar River is located de-jure in Azerbaijan

Azerbaijan

Azerbaijan , officially the Republic of Azerbaijan is the largest country in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west, and Iran to...

 and de-facto in Nagorno-Karabakh Republic

Nagorno-Karabakh Republic

The Nagorno-Karabakh Republic , or Artsakh Republic is a de facto independent republic located in the South Caucasus region of Eurasia...

, in the basin of Kura

Kura River

Kura is a river, also known from the Greek as the Cyrus in the Caucasus Mountains. Starting in north-eastern Turkey, it flows through Turkey to Georgia, then to Azerbaijan, where it receives the Aras River as a right tributary, and enters the Caspian Sea...

. Its length is 115 kilometres (71.5 mi), the area of the basin is 1490 sqkm. The river begins on the Karabakh Plateau at the altitude of 2080 metres (6,824.1 ft) and is formed by the confluence of the rivers Zarysly and Khalfali. The main tributaries

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 are Ballyja, Badara and Daghdaghan. The Qarqar River is fed by the rain, snow and underground waters.

The Askeran fortress

Askeran fortress

Askeran fortress is located in the town of Askeran in the de facto independent Nagorno-Karabakh Republic . It is located on the banks of the Qarqar River and was built by the Karabakh khanate ruler Panah Ali Khan and consists of two sections...

is situated on both of the Qarqar's banks.