Jiayu Pass or Jiayuguan is the first frontier fortress at the west end of the Ming dynasty Great Wall, near the city of Jiayuguan in Gansu province. Along with Juyong Pass and Shanhai Pass, it is one of the main passes of the Great Wall. In the Ming period, foreign merchants and envoys from the Central Asia and West Asia mostly entered China through Jiayu Pass. The pass is located at the narrowest point of the western section of the Hexi Corridor, 6 kilometres (3.7 mi) southwest of the city of Jiayuguan in Gansu. The structure lies between two hills, one of which dominates Jiayuguan Pass. The fortress was built near an oasis that was then on the extreme western edge of China.
The fort is trapezoid-shaped with a perimeter of 733 metres and an area of more than 33,500 square metres. The length of the wall is 733 metres and the height is 11 metres.
