Tiankeng introduction: The Shangfangshan tiankeng is the Leye tiankeng in Guangxi and the Chongqing tiankeng in Sichuan. After its discovery, it was first discovered in northern my country. Its characteristic is that the tiankeng is in the valley area. The Shangfangshan tiankeng was discovered On the mountain, the mouth is small and the bottom is large, in the shape of an inverted trumpet.