Ur

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It flowed near the city walls because it has changed course somewhat, and had about four times the flow that it does today, when it rained there much more, over four times more, during the Ice Age. It began to become the environment like that in the picture circa 1500 B.C., when there were mass migrations of people-groups in the ancient world, to adapt to the new climatic regimes, when the sea level rose to submerge many megalithic city-states.