Juyongguan or Juyong Pass (simplified Chinese: 居庸关; traditional Chinese: 居庸關; pinyin: Jūyōng Guān) is a mountain pass located in the Changping District of Beijing Municipality, over 50 kilometers (31 mi) from central Beijing. The Great Wall of China passes through, and the Cloud Platform was built here in the year 1342.
Juyongguan (pass) is in the 18-kilometer (11 mi)-long Guangou Valley. The pass is one of the three greatest mountain passes of the Great Wall Of China. The other two are Jiayuguan and Shanhaiguan (passes). Juyongguan Pass has two 'sub-passes,' one at the valley's south and the other at the north. The southern one is called "Nan (pass)" and the northern is called "Badaling".
The pass had many different names during former Chinese dynasties. However, the name "Juyongguan" was used by more than three dynasties. It was first used in the Qin Dynasty when Emperor Qinshihuang ordered the building of the Great Wall. Juyongguan pass was connected to the Great Wall in the Southern and Northern Dynasties era.
The present pass route was built in the Ming Dynasty and received much renovation later. It was a very important strategic place connecting the inner land and the area near the northern border of China. It was also used to defend the ancient city of Beijing.