The little Zab River in northwestern Iran rises from the mountains Piranshehr and flows from the northwest to the southeast direction to join Iraq from Alan passage. The River basin contains a large number of ancient settlements, and its lower area that is close to the Zab River has been the most interesting place for people in the Neolithic Age. An increasing population during Chalcolithic Age led to the dispersion of settlements. These sites are located in the north of this basin, in a valley and a little plain.
