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
Sawa Lake Sawa Lake Sawa Lake () is an Endorheic basin located in the Iraqi governorate of Muthanna near to the Euphrates River, some to the west of Al-Samawa city. This lake has no inlet or outlet, but it draws water from the Euphrates through a system of joint cracks and fissures which transport water to aquifers beneath it. The water's level fluctuates during dry and wet seasons but does not dry up because of the equilibrium state between water feed and evaporation. Lake Sawa is a unique body of water in Iraq since characterized by highest salinity value (up to 35