Lake Tharthar, which opened in 1956 in the Al Anbar Province was formed during the Holocene age covering 790 square miles.
Lake Tharthar (also Therthar), and known in Iraq as Buhayrat ath-Tharthar (Arabic:  ), is an artificial lake opened in 1956, situated 100 kilometers northwest of Baghdad between the Tigris and the Euphrates rivers. Al Anbar Province The Tharthar depression was formed during the Holocene age, mainly by karstification, due to dissolving of gypsum rocks of the Fatha (nearby area) Formation. Tharthar covers roughly 2,050 km (790 sq mi), flows from the central and eastern parts of the Sinjar Mountains and adjacent hills, with a floor of 3 m, above the sea level. 
