DURA EUROPOS, ruined city on the right bank of the Euphrates between Antioch and Seleucia on the Tigris, founded in 303 B.C.E. by Nicanor, a general of Seleucus I. It flourished under Parthian rule. The site is in modern Syria, on a plateau protected on the east by a citadel built on bluffs overlooking the river, on the north and south by wadis, and on the west by a strong rampart with powerful defensive towers. Its military function of the Greek period was abandoned under the Parthians, but at that time it was the administrative and economic center of the plain extending 100 km between the confluence of the Ḵābūr and Euphrates rivers and the Abū Kamāl gorge to the south.