Introduction to Huangya Shuiguan: Huangya Shuiguan is the famous Shuikou Pass on the Jingdong Great Wall. It controls the Gou River Valley, connects Taiping Village to the east and Huangyaguan City to the west. It was built during the Yongle period of the Ming Dynasty. Due to disrepair for a long time, the walls collapsed and were restored on the original site in 1992. A battlement horse road is built on the top and a five-hole water tunnel is built below.