Speaking of Gansu, as we all know, Gansu is located in the northwest of China. Although the geographical position of Gansu Province is relatively partial, its historical background is also very profound, because it has been the only way for the Central Plains to reach the western regions since ancient times and is also a part of the Silk Road. Dunhuang, Zhangye and Lanzhou in Gansu are all famous tourist cities, and many scenic spots have attracted tourists from all over the country, such as the Mogao Grottoes in Dunhuang.
Xinjiang, which borders Gansu, has been the westernmost part of Hexi Corridor since ancient times, and it is also close to the western regions. It is also an exchange fortress between the ancient western regions and the Central Plains. As early as the Han Dynasty, the Silk Road in the Western Regions was opened at that time, so the prototype of Yumenguan appeared in the Han Dynasty. Why is it called Yumen Pass? Because the western regions were rich in jade at that time, many businessmen and people from the Central Plains came here with jade, so this pass was called Yumen Pass.
Yumenguan site is located at the westernmost end of Hexi Corridor. The surrounding terrain is also composed of Gobi and desert. Qilian Mountain is in the south, and the mountain in the north is called Beishan, which is about 90km away from Dunhuang city and about lop Nur 150km away from the west. In ancient history, it was also used as the main artery connecting the East and the West, the local Great Wall in Han Dynasty, and an important part of the military defense system in ancient Hexi area.