It was located on the eastern edge of what we call Mesopotamia. Medicine day Iraq, the Persian Gulf area, right where the Tigris and Euphrates come together to pour into that Persian Gulf. But they were able to do five things that nobody else could do that gives them the title of their earliest civilization. Now number one, you need to have advanced cities. And Sumer certainly had numerous cities that were called city-states. They had Ur and Uruk and Umah and Kish and Lagosh. Now these cities shared trade routes.