Yumenguan, also known as Xiaofangpan City, is within the jurisdiction of Dunhuang City at the western end of the Hexi Corridor. It is located about 90 kilometers northwest of Dunhuang urban area. It is said that in ancient times, the beautiful jade from Khotan and other places in Xinjiang passed through this place from the Tarim Basin to be transported to Central Plains, and Yumenguan got its name in this way.