Introduction to Qutan: Walking along the stream from Pingshatan, there are two mountains that almost collide. There is only a two-meter-wide channel at the foot of the mountain. Spring water flows under the root of the cliff. On the north side of the cliff are carved With two big characters "Dragon Gate", the Qutan is at the narrowest point at the base of the two cliffs. It has three bends and nine twists. It is about 9 meters long and only 60 centimeters wide. Visitors will feel a thrill when passing through it.