Introduction to the city wall Lazi Mountain City ruins: It is located on the top of the west bank of the central Jingbo Lake in Ning'an City. It is a mountain city site from the Bohai period of the Tang Dynasty. Here you can look up at the towering city walls and the mountain city. Standing on the mountain city, you can see Xiaogu Mountain to the north. Looking down at the Pearl Gate to the south, the mountain city and the blue waves complement each other, and the cultural relics and natural scenery are integrated.