Baiyu Shaft

　　   The Baiyu Shaft is situated on the southern bank of the Beipan River, approximately 5 kilometers to the right of Wuyi Bridge on the Shuipan East Line. It is part of the Wumeng Mountain National Geopark. This is a rare vertical shaft in the world, reaching a depth of 560 meters, making it the deepest of its kind globally. From the surface to a depth of 424 meters, the shaft remains perfectly vertical, allowing a single rope to reach that depth directly — making it the deepest vertical shaft in the world where one can literally "look up at the sky from the bottom of a well." Standing beside the shaft and peering down into its seemingly "bottomless" abyss is an awe-inspiring and thrilling experience. The Baiyu Shaft is a uniquely formed vertical cave. The area features gently sloping strata, where surface water penetrates the overlying non-carbonate rock layers and forms unsaturated calcium carbonate solutions. These solutions then dissolve the carbonate rock layers along fractures over time, eventually carving out this distinctive vertical cave.