One of the main tributaries of Tigris River, east of Baghdad, Iraq, where four sites were excavated: Tell Asmar (Eshnunna), Khafajah (Khafaje), Ischali, and Tell Aqrab of the Jemdet Nasr and Early Dynastic periods. The work allowed the establishment of a pottery sequence for this part of Mesopotamia, from the late 4th to the early 2nd millennium BC and the investigation of a number of important buildings of the periods.