Yumen is a city in western Gansu province, China. It is a county-level city with a population of 106,812, and is part of Jiuquan "prefecture-level city". It is located on the Silk Road and is best known for its oil production. The city's name is often confused with the Yumen Guan or Jade Gate which is the frontier-pass of ancient times, the entrance to the old Silk Roads, which was situated not far to the west of Dunhuang.