Introduction to the Underground Three Gorges: The Underground Three Gorges include Xiaokui Gorge, Xiao Wu Gorge and Xiao Xiling Gorge. They are majestic, magical, spectacular and unpredictable. After the river was closed, part of the Three Gorges of the Yangtze River became the underwater Three Gorges. The underground Three Gorges in Yishui can just make up for this shortcoming in tourism.