Introduction to the One Thread Sky: The geological landscape of Mount Tai is located to the west of the Taohuayuan parking lot, with two peaks facing each other, and a thin line in the middle, through which people can pass. It is the product of the combined effects of fault structure cutting, weathering and erosion, water transport and gravity collapse. When you are in it, you can see two cliffs as sharp as a knife. Looking down at the huge rocks under your feet, looking up at the sky, you can only see the sky like a thin line. Entering the mountain along a small road from the first line of sky, the mountain is steep. In the deep valley, a waterfall falls from the sky. The mountain is green and the water is strong. Its name is Houchou Valley, which is extremely precipitous.