Introduction to Tianmen Ya: It is 2328 meters above sea level, 12 kilometers away from Hongping. It borders Donggou and Haofang to the southwest, and confronts Yanzi Ya to the northeast. On both sides of the mountain are dangerous cliffs with stacked rocks, green pine, red birch, yew, and mountain flowers. During this period, because it was often covered by clouds and fog, climbing up this mountain was like climbing into the sky, hence its name.