Where is Qin Changcheng?

According to historical records, Qin Changcheng started in Lintao, Gansu, and ended in Liaodong. The Great Wall of Qin Shihuang is the first Great Wall of Wan Li in the history of China, which was connected with the Great Walls of Qin, Zhao and Yan after the unification of the six countries. However, due to wind and rain, man-made destruction and other reasons, Qin Shihuang's Great Wall in Wan Li has been basically annihilated. At present, the specific location of the Great Wall of Qin Shihuang in Wan can only be inferred from historical records, but its real existence is an urgent problem for Great Wall studies, history and archaeology. The Great Wall of Ming Dynasty starts from Yalu River in the east and reaches Jiayuguan in the west, passing through Liaoning, Hebei, Tianjin, Beijing, Inner Mongolia, Shanxi, Shaanxi, Ningxia and Gansu.