The Aras River is a river located in the Caucasus region of Eurasia, and it forms part of the border between Turkey and Armenia. It is also known as the Araxes or Aras, and it is the longest river in the region, with a length of 1, 072 km. The river originates in Turkey and flows through Armenia before emptying into the Caspian Sea. The Aras River is an important source of water for both countries, and it is also used for irrigation and hydroelectric power generation.