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
Khabur (Euphrates) it the "Aborrhas" (Ἀβόρρας), and Isidore of Charax called it the "Aburas" (Ἀβούρας). It was described as a large river of Mesopotamia which rose in Mons Masius, about from Nisibis, and flowed into the Euphrates at Circesium (Kerkesiah). Procopius speaks of it as a river of importance, and Ammianus states that Julian the Apostate crossed it “per navalem Aborae pontem.” Strabo describes it as near the town of Anthemusia. The river is fed by several smaller streams, the names of which are mentioned in the later classical writers. These are, the Scirtus (Procop. "de Aedif." 2.7), the Cordes (Procop. "de