The Murat River
(Murat Nehri) is the major source of the Euphrates
. It was also called Arsanias in antiquity. The river originates near Mount Ararat
north of Lake Van
, in eastern Turkey
, and flows westward for through mountains and unites with the Karasu Çayi to form the Upper Euphrates
Turkey's largest dam, the Keban Dam, was completed in 1974 and is designed to provide electrical power.