临洮县
Established by Shi Huangdi, it originally covered the entire territory of the Qin Empire west of Mount Long with its seat at Didao (present-day Taoyang in Lintao County). This area included most of the upper Wei valley. Its principal route of communication was the Long Road (named for the mountain), which probably passed along the course of the modern railroad west from Xi’an although much of the area nearest the river was then marshland. The territory was used as a staging ground for campaigns up the Tao and the upper Yellow River.