Panjiakou, called Lulongsai in ancient times, is located in the north of Qianxi County, Hebei Province, and has been a place of great importance since ancient times. During the Hongwu period of the Ming Dynasty, it began to set up a pass at Panjiakou, which is located in the north of the current site. In the 41st year of Jiajing (1562), Xinguan Pass was built at this site and a castle was built. The pass is two feet high and has a circumference of 219 feet. It has two gates in the southwest and was once guarded by a thousand generals. In October 1975, the state began to build the Luan River Diversion Project - Panjiakou Reservoir. At the end of 1984, the reservoir was completed and the Panjiakou Great Wall was submerged, forming a unique underwater Great Wall. [1]
