Jiayuguan, known as the "first Xiongguan in the world", is located in the middle of the narrowest valley 5 kilometers west of Jiayuguan City, Gansu Province. The walls on both sides of Chengguan cross the desert Gobi, the Great Wall of Montenegro in the north, and the first pier in the south. It is the westernmost gate of the Great Wall of Ming Dynasty. It has been known as Hexi throat in history. Due to the danger of the terrain, the building is majestic, and it is known as the key of the lock. Jiayuguan is a traffic fortress of the ancient "Silk Road", one of the three wonders of the Great Wall of China (Shanhaiguan in the east, Beitai in the town, and Jiayuguan in the west).