Uruk (Erech or Walka) - 250 acres of town 4,500 to 3,250 BC

The picture shows the north-eastern side of the ziggurat in the temple precinct of E-anna at Uruk, a large town on the river Euphrates, which was highly developed as early as 4,500 BC. An international trading centre, Uruk lay at the heart of the archaic Sumerian civilization, a product of many thousands of years of agricultural prosperity and expansion due to superb social organisation.

From the Larouse Encyclopedia of Archaeology