Huanglongdong - "located in Wulingyuan Scenic Area, the core scenic spot of Zhangjiajie City, Hunan Province, is a typical karst landform. The cave is 7.5 kilometers long and 140 meters vertical. The cave body is divided into four layers, with three-dimensional cave structure, huge cave space, broad Dragon Palace Hall and tens of thousands of stalagmites, tall cave waterfalls, both land and water tourism lines and other advantages constitute a fairly distinctive tourist cave at home and abroad. The cave has a reservoir, 2 rivers, 3 pools, 4 waterfalls, 13 halls, 98 corridors, dozens of peaks, thousands of Baiyuchi pools and nearly 10,000 stalagmites. Stone stalagmites, stalagmites, pillars, flowers, mantles, branches, pipes, pearls, coral and other cave wonders condensed from lime solution are all over the cave, which is the world's karst cave "all-round champion".