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
Euphrates Tunnel Euphrates Tunnel The Euphrates Tunnel was allegedly a tunnel which was built under the Euphrates river to connect the two halves of the city of Babylon, in the old Mesopotamia. Archaeologists believe it was built between 2180 and 2160 BCE. No other sub-aqueous pedestrian tunnel was attempted until Marc Brunel built the Thames Tunnel beginning in 1824 CE. Construction allegedly began with a temporary dam across the Euphrates river, and proceeded using a "cut and cover" technique. The tunnel allegedly spanned 12 feet high and 15 feet wide, it is presumed that it was used by pedestrians and horse driven