Introduction to a line of sky: The sky forms a line here, with two towering mountain walls. Traces of water seeping from years of rain make the stone walls look like ancient paintings, like closed curtains. The line of sky here is small and large, and the water below is continuous. The clear and clear water is covered with colorful stones, which contrast with the flowers and plants in the rock crevices not far away. It is quiet, strange, unique, colorful and unique. All in one, it can be called a tourist attraction.