Defines the western border of Mesopotamia; it also rises in the Zagros Mountains of Turkey and its shores are home to Fallujah and Babylon. It is the longer of the two rivers, with a course of 1,740 miles (compared to the Tigris' 1,180). Both the Tigris and the Euphrates have changed courses several times, leaving ruins in the desert where cities have been abandoned.

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1. Defines the western border of Mesopotamia; it also rises in the Zagros Mountains of Turkey and its shores are home to Fallujah and Babylon. It is the longer of the two rivers, with a course of 1,740 miles (compared to the Tigris' 1,180). Both the Tigris and the Euphrates have changed courses several times, leaving ruins in the desert where cities have been abandoned.