Introduction to the Sanguan Ancient Great Wall: The Sanguan Ancient Great Wall is located at the eastern foot of Helan Mountain, more than 40 kilometers away from Yinchuan City. It is an important transportation route from Ningxia to Alxa Left Banner in Inner Mongolia. During the Ming Dynasty, for the sake of border security, the government built the Great Wall (called the border wall in the Ming Dynasty) and set up passes at the three passes, which became one of the "four dangers" for the city defense of Ningxia at that time. The wall stretches to the top of the mountain. The mountain is steep and the terrain is dangerous. It has the potential of "one man can guard the pass, but ten thousand men cannot open it".