In 1988, Hua Xiazi wrote a book named "textual research on the great wall of the Ming Dynasty". It was mentioned here: "the great wall passes a mountain with an altitude of 946.9 meters. The stone wall goes down from the peak. There are fifty-one steps on the top of the wall and a depression below it, which is called fifty-one step ditch locally."
Address: about 3 km northeast of ganyugou village, Beizhuang Town, Miyun County, Beijing
Longitude: 117.22215668787
Latitude: 40.482855246992
Chinese PinYin : Wu Shi Yi Deng Zhang Cheng
Fifty one steps on the Great Wall
Shanghai Yangshan deep water port. Shang Hai Yang Shan Shen Shui Gang