They used irrigation systems and dammed parts of the rivers into small pools to reduce the risk of flooding and to increase the water supply.
The land of the Tigris and Euphrates River valleys.
tigris and euphrates
The peoples who settled the fertile valleys of the Tigris and Euphrates Rivers.
The Tigris and Euphrates river valley.
Tigris and Euphrates
they were all sacred rivers where there was a community
Nile, Tigris-Euphrates, Indus, Yangtse.
borders and elevations that were easy to defend
Mesopotamia has two rivers, the Tigris and the Euphrates.
The Tigris and Euphrates river systems, in modern-day Iraq.
Mesopotamia. The people who lived there were called Sumerians.
No one "founded" the rivers.found(ed) is a transitive verb meaning: To establish or set up, especially with provision for continuing existence.If you mean: who found the Tigris-Euphrates river valleys? Then the answer would be some prehistoric man. Or the people who were looking for the valleys..