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The 2 rivers join each other but that was not always the case
The river flows all through Iraq and eventually drains into the Persian Gulf. One of the most intriguing facts is that it first joins the Euphrates river to form the “Shatt al-Arab,” the river formed from the confluence of the two major rivers.
This confluence happens near a town called “al-Qurnah” and flows for approximately 200 kilometers (120 miles) before draining into the Persian Gulf near the port city of Basra. According to Roman historian Pliny the Elder, who lived in the 1st century A.D., this confluence didn’t actually exist about 2,000 years ago, and both the Tigris and the Euphrates were directly released into the Persian Gulf back then.