Tongtian Waterfall, also known as “Gexian Cave”, is located in the northwest of Xukou Town, Fuyang District. It is a waterfall landscape located inside a cave. Tongtian Waterfall is a waterfall with a drop of more than 120 meters made up of Shuanglong Waterfall and Zhulian Waterfall. Located in a cave, each waterfall is one level higher than the next, forming the only "waterfall group" in eastern China. The cave in the scenic area is a karst underground river cave. It is a vertical cave consisting of a pool, two pools, three rivers, six waterfalls, five corridors and six halls. There are a lot of strange stone pillars in the cave, and the terrain is also somewhat precipitous. It is very interesting, particularly embellished with its multicoloured lighting.