Introduction to Ma'an Bridge: There is a sunken mountain ridge between the south peak and the middle peak, about 300 meters lower than the south peak and 100 meters lower than the middle peak, shaped like a saddle. Standing on the Ma'an Bridge, you can see Zuoxugou from the inside, which is lush and green, and the Tanyu Valley from the outside, with shadows and mist. You can step on a hundred-foot cliff and have thousands of wind and smoke above your head, which makes you feel frightened.