It is 2.8 kilometers long. It is connected by Tongling Gorge, Nianba Gorge, underground river and tunnel. First, it comes to a sinuous cave along the ladder. Then it goes to the end along the riverbank. Then it sees the water falling from tens of meters high. From a distance, it feels that the water flow is very small and unimaginable. However, when approaching, the sound of the water becomes louder and louder, and the water falls and splashes from the stone wall. Flowers form a mist, which falls on the passage like a heavy rain. Fortunately, they all carry umbrellas. Walking into the mountain below the canyon, there are some stalactites and hanging coffin burial caves, but there is no hanging coffin, the natural scenery is still worth seeing.