Located at the top of Dongtianjingzhai Village, Liu Tianjing Village, Wu 'an, there stand three boundary pillars: Wu 'an, Fengfeng and Cixian. When you climb it, you can experience the feeling of stepping on three counties with one foot.

Liu Tianjing Village is located in the south of Hebei Province, southwest of Wu 'an City, bordering Fengfeng and Cixian. It was the earliest village in Hongzhi period of Ming Dynasty (around 1490), surrounded by mountains and adjacent to Chai Tian Well and Gaotian Well Village. On the top of the East Tianjing Village in Liutianjing Village, there are the boundary pillars of Wu 'an, Fengfeng and Cixian established by the State Council in 1989, which are called Sanjie boundary pillars.