Tigris–Euphrates river system Tigris–Euphrates river system The Tigris and Euphrates, with their tributaries, form a major river system in Western Asia. From sources originating in eastern Turkey, they flow by/through Syria through Iraq into the Persian Gulf. The system is part of the Palearctic Tigris–Euphrates ecoregion, which includes Iraq and parts of Turkey, Syria, Iran, Saudi Arabia, Kuwait, and Jordan. From their sources and upper courses in the mountains of eastern Anatolia, the rivers descend through valleys and gorges to the uplands of Syria and northern Iraq and then to the alluvial plain of central Iraq. The rivers flow in a south-easterly direction
Cordes (river) Cordes (river) Cordes () was a small stream of Mesopotamia which rose in the Mons Masius, and was a tributary of the Chaboras, itself a tributary of the Euphrates. The town of Dara was situated upon its banks. Justinian's engineers diverted the river towards the city by digging a canal. The river now flowed through the city, ensuring ample water supply. At the same time, by means of diverting its flow to an underground channel which exited to the north, Dara's garrison was able to deny water to a besieging enemy, a fact which saved the city on several occasions.