introduce
Sanguankou Ming Great Wall is the junction of Ningxia and Alxa Left Banner of Inner Mongolia. The three passes are from east to west. There are Toudaoka, Erdaoka and Sandaoka, which are called Sandaoguan by later generations. The mountains here are winding and winding, and the terrain is majestic and steep. In the col where the two mountains were originally facing each other, a pass was built.
Yinchuan is located in the northwestern border of the motherland. In the Ming Dynasty, the Mongolian Tatars and Oirats often entered the Chimukou of Helan Mountain from the Alashan Platform in Inner Mongolia, and drove directly to all parts of the plain. For the sake of border security, the rulers of the Ming Dynasty built the Great Wall (known as the side wall in Ming Dynasty) and set up passes at three passes, making it one of the "four dangers" of ancient Yinchuan city defense.
When the Great Wall was built, there were more sand and gravel than soil, so the soldiers excavated all the cliffs and valleys, and got several places of loam soil; because there was no water, they built hundreds of water trucks to fetch water from Pingji Fort, which was more than 20 kilometers away from the pass, and mixed the loam and gravel. Mixed and rammed together, it is extremely strong.
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