Aras, which in Azerbaijani language is called "Araz", is the most important river in northern Iran and Azerbaijan provinces. This river originates from the Goel Daq Mountain in Turkey and after joining the Kor River, it finally pours into the west end of the Caspian Sea. The river marks the border between Iran and Armenia and Azerbaijani Republics. There are many important dams over this river irrigating the surrounding areas in the Moqan Plain and some of the most important agricultural lands in Iran.