What is the importance of the Euphrates and Tigris rivers?

Answer:
Those are the two rivers in what is now Iraq, which in earlier historical times defined the region of Mesopotamia, which was the site of the earliest civilizations, and which was extremely influential in the evolution of human culture as we know it today.
First answer by David6023. Last edit by David6023. Contributor trust: 511 [recommend contributor recommended]. Question popularity: 2 [recommend question].