Introduction of Tigris river
River of SW Asia, rising in the Taurus Mts, E Turkey and flowing SE through Iraq to join the Euphrates River, to form the Shatt al Arab, emptying into the Persian Gulf. It is 1,180 miles long and is subject to sudden and violent flooding. Along with the Euphrates it formed the basis of the Fertile Crescent. The land between the two rivers, Mesopotamia in Greek, was an early center of civilization. In antiquity, when some of the great cities of Mesopotamia were built on its banks, including Ashur, Nineveh, Ctesiphon, and Seleucia, it was important for transportation and was surrounded by irrigation systems. Today the improvement of rail and road facilities has caused its importance as an artery to decline.