Introduction to the Wall Ditch: The Wall Ditch is three stone walls arranged in parallel, so it is called the "Flat Wall Ditch". The first stone wall is 566.69 meters long and 106.5 meters high. The thickest part is more than ten meters and the thinnest part is only 1 meter. There are five natural stone windows on the stone wall, and the blue sky can be seen across the mountain. The two stone walls are 333.3 meters long and 80 meters high. The "Echo Wall" can be called a wonder outside the Great Wall. The three stone walls are "wanting to compete with God". It is said that you can climb to the top of the sandwich wall to view the eight major sceneries. This landscape is extremely rare in our country and is one of the best in the world.