This first volume in a series of works on Tell Kosak Shamali focuses on the Chalcolithic deposits at the site, or the Ubaid period. Located on the east bank of the Euphrates the site held an important strategic position and one which had a diverse set of resources available. Investigated since the 1980s and most recently by the University of Tokyo, this volume reports on the results of the excavations, detailing the geographical and cultural setting of the site, the architecture and stratigraphy, the radiocarbon dates, the nature of the finds and the history of the site in the Palaeolithic, Neolithic and Chalcolithic. Evidence from Kosak Shamali provides important insights into the transition from Neolithic agrarian societies to more complex, increasingly urban societies of the Chalcolithic.