Cave Hall Introduction: Qianqiutian, also known as Bianshiba, is another exquisite product in Boyue Cave and is a magical creation of nature. The highest edge stone dam is 0.63 meters, the lowest is 0.05 meters, and the length is 7.35 meters. From near to far, they are arranged in a winding and winding way like the length of the city. The layers are stacked on top of each other, criss-crossing, and they look like a terraced field. The spring water fills the hills and terraces, gurgling from top to bottom, making a tinkling sound, creating an idyllic scenery and a paradise.