Introduction to the wonders of the pothole: The locals call it "the stone urn", which is a round stone pit formed on the huge rock at the bottom of the stream by the impact of the rushing stream for hundreds of millions of years. The three pot holes here are arranged in sequence from top to bottom. The walls are round and smooth. The water in the hole is deep and clear. There are small fish floating in the hole, "as if you are swimming in space and have nothing to rely on." It was called "a unique wonder in China" by Zhao Xun, a consultant expert on geoparks of UNESCO.