Aoan Qingshan Pass

From Laolongtou in the east to Juyongguan in the west, it was built in the Warring States Period, connected to the Qin Dynasty, and finally built and expanded on the eternal Great Wall of the Ming Dynasty. There is a Qingshuan in Qingshankou Village, Shangying Township, Qianxi County, Tangshan City, Hebei Province (in September 1947, the west of Qian'an was designated as Qianxi County). Since Zhu Yuanzhang led the peasant insurrectionary army to push to the Yuan Dynasty, the remnants of the Yuan and Mongolian have repeatedly sought revival based on the Mongolian grasslands and various parts of the northeast, constantly invading the ......