Introduction to the One-line Sky: Because the two stone peaks are 26.13 meters and 17.97 meters high respectively, and are only about 35-45 centimeters apart, they form a gap straight up and down, which can only allow one person to pass, so it is named "One-line Sky". ". In fact, the sky is formed by the cracks (joints) of geological movement and weathering. It is the best in the granite stone forest landscape.