This is the natural barrier in Luohanyan – Yixiantian, literally translated as A Line of Sky. The mountain is approximately 300 meters tall. As you may see, the cliffs of these two mountains are steep, with only a narrow crack in the middle that allows only one person at a time. You can climb up to the hilltop from the crack. If you look up from below, you may only see a line of the sky. The characteristics about “Yixiantian” are that the higher you climb, the steeper it gets, and your world becomes wide again if you walk out of it. Standing on the top of “Yixiantian” and look down, and you can still be frightened.