Tigris–Euphrates river system - Wikipedia
https://en.wikipedia.org/wiki/Tigris%E2%80%93Euphrates_river_system
OverviewDefining MesopotamiaUpper MesopotamiaLower MesopotamiaPerennial irrigationSee alsoBibliographyFurther readingThe geography of Mesopotamia, encompassing its ethnology and history, centered on the two great rivers, the Tigris and Euphrates. While the southern is flat and marshy, the near approach of the two rivers to one another, at a spot where the undulating plateau of the north sinks suddenly into the Babylonian alluvium, tends to separate them still more completely. In the earliest recorde…
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