Introduction to Hongyan Book of Heaven: Located on the middle of Hongya Mountain, about 7 kilometers away from Huangguoshu Waterfall, the cliff is light red in color, 100 meters long and more than 30 meters high. There are more than 21 dark red symbols that resemble ancient texts on the stone wall. The seal script is not seal script, if it is not official, it is not engraved, it is not engraved, it does not line up horizontally, it does not line up vertically, the big one is like a bucket, and the small one is like a rising, all reveal a simple and vigorous charm.