Jiayuguan Guancheng is surrounded by mountains and rivers and guards the canyon zone about 15 kilometers wide from north to south. The valley in the south of the canyon constitutes a natural barrier for the defense. There are a total of 66 piers and piers in the east, west, south, north and northeast of Guancheng. Jiayuguan has a natural terrain, both offensive and defensive. It has formed a strict military defense system with the nearby Great Wall, Chengtai, Chenghuang and Sui, and is also known as "the world's first Xiongguan".