The Tigris and Euphrates was a river system found in Mesopotamia.
The rivers connected to the Persian Gulf and along their length were the cities of Ur, Uruk, Nippur, Lagash, Babylon, Ashur and Nineveh. The river was referred to as the "cradle of civilization", as some of the earliest known civilizations such as Sumer, Babylon and Assyria were founded on the river.
Behind the scenes
The Tigris and Euphrates river system is a real-life series of rivers found in modern day Turkey and flow through Syria to Iraq. They appeared in The Cradle of Civilization, a story featured in the third installment of La Storia Universale