Introduction to the Southeast Barrier: Going south from Aishanting, you can see an isolated peak standing upright. The whole peak is composed of three huge rocks in the shape of "pin". Climbing up dozens of stone steps, you will feel as if Mount Tai is overwhelming you. This is Jinping Peak, also known as Shipingfeng and Shimen Tower, which stands out among the many strange peaks and rocks in Nanyan. It has been the main attraction of Nanyandang Mountain in all dynasties. It was developed in the middle of Tang Dynasty and was called Shimen Tower in Song Dynasty. This peak is 33 meters high, 50 meters wide and about 4 meters thick. The cave gate under the main peak is 4 meters high and 6 meters wide. There is a cliff stone carving with the words "Southeast Barrier" on the lintel.