That's why the Tigris/Euphrates was so important. Even to this day, despite recent mucking about with waterflow, there is still a fairly large series of swampla

That's why the Tigris/Euphrates was so important. Even to this day, despite recent mucking about with waterflow, there is still a fairly large series of swamplands/marshes in southern Iraq that most people don't imagine when they are asked to describe the geography of Iraq. https://en.wikipedia.org/wiki/Mesopotamian_Marshes https://en.wikipedia.org/wiki/Mesopotamian_Marshes