Euphrates Turkey, in Syria and in Iraq. The same figures are given by Isaev and Mikhailova. The length of the Shatt al-Arab, which connects the Euphrates and the Tigris with the Persian Gulf, is given by various sources as . Both the Kara Su and the Murat Su rise northwest from Lake Van at elevations of and amsl, respectively. At the location of the Keban Dam, the two rivers, now combined into the Euphrates, have dropped to an elevation of amsl. From Keban to the Syrian–Turkish border, the river drops another over a distance of less than . Once the Euphrates
Nossob River flow about once a century. However, water does flow underground to provide life for grass and camelthorn trees growing in the river bed. The Nossob may flow briefly after large thunderstorms, causing wildlife to flock to the river. The Nossob ends at a confluence with the Molopo River some 50 km south of Twee Rivieren. The confluence at is still 890m above sea level. The Molopo is in turn a tributary of the Orange River, which it meets downstream of Augrabies Falls. Important dams in the basin, both on the Oanob River, a tributary of the Auob: Nossob River The