Highlights: 1. It came into being in 2 hundred thousand years ago, developing from the huge Karst fissure. It’s one of the extreme large caves in China and the longest one among the north of Yang’zi River, being honored as the “ the First cave of floating underwater in China” 2. The gorge is nearly 100 meters deep and the steep cliff just like being suddenly cut. The widest place is over 100 meters wide while the narrowest can only hold one person. All these make up a micro but complete the underground Three Gorges. 3. Through visiting the wonderful scenery on two sides and top of the gorge, you can enjoy the unique happiness which is different from that got through playing on the ground.