Mesopotamia

Mesopotamia was a region on Earth in Asia. It was the place where human civilisation began, and was home to the city-states of Uruk and Kish. The Seventh Doctor and Ace visited the region in 2700 BC. (NA: Timewyrm: Genesys)

Mesopotamia was later home to the city-state of Babylon, which was visited by Bernice Summerfield. (BNA: Walking to Babylon)