The Gadar River rises in the IranianZagros Mountains close to where the borders of Iran, Turkey and Iraq meet. From its source, the river flows towards the southeast and then changes course due east through the Ushnu-Solduz valley. After leaving the valley, the river turns north and flows into the marshes bordering the endorheicsaltwaterLake Urmia. The length of the river is approximately 100 kilometres (62mi), its drainage basin is variously estimated as 1,900 square kilometres (730sqmi) and 2,123 square kilometres (820sqmi) and its discharge is 0.34 cubic metres (12cuft) per second. The Ushnu-Solduz valley has been occupied for many millennia, as testified by the excavations at sites like Hasanlu Tepe and Hajji Firuz Tepe.[1][2]
Ghaheri, M.; Baghal-Vayjooee, M.H.; Naziri, J. (1999), "Lake Urmia, Iran: A summary review", International Journal of Salt Lake Research, 8: 19–22, doi:10.1023/A:1009062005606
Voigt, Mary M. (1983), Hajji Firuz Tepe, Iran: the Neolithic settlement, University Museum Monograph, vol.50, Philadelphia: University Museum, ISBN0-934718-49-0
