Where were the city states of sumer developed in?

The city-states of Sumer were developed in the southern part of ancient Mesopotamia, primarily in what is now modern-day Iraq. This region, situated between the Tigris and Euphrates rivers, provided fertile land that supported agriculture and enabled the growth of complex societies. Key city-states included Ur, Uruk, and Lagash, each functioning as independent political entities with their own governance and culture.