By the late 4th millennium BC, Sumer was divided into about a dozen independent city-states, whose limits were defined by canals and boundary stones. Each was centered on a temple dedicated to the particular patron god or goddess of the city and ruled over by a priestly governor (ensi) or by a king (lugal) who was intimately tied to the city's religious rites.
 

 
| The five "first" cities said to have exercised pre-dynastic kingship:    
Eridu (Tell Abu Shahrain)Bad-tibira (probably Tell al-Madain)Larsa (Tell as-Senkereh)Sippar (Tell Abu Habbah)Shuruppak (Tell Fara) Other principal cities: 
Kish (Tell Uheimir & Ingharra)Uruk (Warka)Ur (Tell al-Muqayyar)Nippur (Afak)Lagash (Tell al-Hiba)Ngirsu (Tello or Telloh)Umma (Tell Jokha)Hamazi Adab (Tell Bismaya)Mari (Tell Hariri) Akshak Akkad Isin (Ishan al-Bahriyat) | Minor cities (from south to north): 
Kuara (Tell al-Lahm)Zabala (Tell Ibzeikh)Kisurra (Tell Abu Hatab)Marad (Tell Wannat es-Sadum)Dilbat (Tell ed-Duleim)Borsippa (Birs Nimrud)Kutha (Tell Ibrahim)Der (al-Badra)Eshnunna (Tell Asmar)Nagar (Tell Brak)    |