Introduction to the No. 1 Lane in the World: "The No. 1 Lane in the World" Ganfang Lane is composed of 4 main peaks in the west, north, east and south, 7 secondary peaks and 4 main passes. The plane shape is an irregular polygon, with the main peak The altitude is 1021-1060 meters. The depression is surrounded by steep slopes with a slope greater than 70 degrees. Part of it is a cliff. It has a large mouth and a small bottom. It is 530 meters deep and has a volume of 188.4 million cubic meters. Affected by secondary joint fissures, the Nongkou is also divided into eight trough-shaped valleys in different directions. It is the deepest and largest depression in the world's karst area. You can reach the bottom of the depression along the 1,418 steps snaking through the rocky bushes.