32 kilometers. Hetaoyu Minefield is located in the southwest of Zhengning County, and the administrative division is under the jurisdiction of Zhoujia Town of Zhengning County. The mine field is about 15.429km long from east to west. Zhengning County belongs to Qingyang City, Gansu Province, and is located in the southeast of Qingyang City, Gansu Province, at the west foot of Ziwuling, bordering huangling county in Shaanxi Province in the east, Xunyi County in Shaanxi Province in the south and Binxian County in Shaanxi Province in the southwest. It takes 45 minutes to drive there.