秦嶺山脈
In Tang dynasty, Jingzhao was a superior prefecture () created in 713 AD by converting Yong Prefecture (). It lay north of the Qin Mountains in Shaanxi with Chang'an as its core. A census taken in 742 AD reported a total of 362,921 households (population: 1,960,188), while a census taken ca. 813 AD reported only 241,202 households.