The Great Zab or Upper Zab (Arabic: الزَّاب الْكَبِيْر, romanized: ez-Zâb el-Kebîr; Kurdish: Zêy Badînan or Zêyê Mezin; Turkish: Zap; Syriac: ܙܒܐ ܥܠܝܐ, ) is an approximately 400-kilometre long river flowing through Turkey and Iraq. It rises in Turkey near Lake Van and joins the Tigris in Iraq south of Mosul. During its course, the river collects water from many tributaries and the drainage basin of the Great Zab covers approximately 40,300 square kilometres. The river and its tributaries are primarily fed by rainfall and snowmelt – as a result of which discharge fluctuates highly throughout the year. At least six dams have been planned on the Great Zab and its tributaries, but construction of only one, the Bekhme Dam, has commenced but was halted after the Gulf War.
