Introduction to the One-line Sky: Looking up from the bottom of the cliff, you will see the cliffs on both sides facing each other. It is breathtaking and spectacular. Only a line of blue sky can be seen, so it is named "One-line Sky". It is 71 meters long, 72 meters at its widest point, 0.65 meters at its narrowest point, allowing only one person to pass, and its deepest point is 31 meters.