Huping Mountain(kettle-shaped Mountain), Roof of Hunan, located in Shimen County, is the state-listed nature reserve as well as one of the 200 global key ecological areas. It is also famous as a natural labyrinth of Global Fantastic Circle and a species gene bank in Central China. 350 million years ago, Huping Mountain was a vast ocean. Because of orogenesis movements of Yanshan Mountain and Himalayas and long-lasting geological changes, the uncommon landforms and ecological environment take shape. Huping Mountain with perilous peaks and deep valleys embodies 266 peaks at an altitude of over 1000 meters and a major lofty peak, 2098.7 meters above sea level, which is the highest peak of Hunan. It boasts the deepest, narrowest and grandest gorge in Mid-east area. The gorge, over 200 kilometers in length, with a relative height of peaks and valleys varying from 800 meters to 1000 meters, exposes a great deal of typical annual sections, including the largest Cambrian Stratum section in the world. Huping Mountain has plenty of waterfalls, water-eroded caves, streams in the crisscross network. The largest Huping Waterfall is 400 meters high and 20 meters wide. Once Libai(a great poet of Tang Dynasty) traveled here and made such fine comments as "waterfalls splash in Huping, peach flower falls down the mouth of cave". Rafting in Huping Mountain, which has more than 80 dangerous shoals, with 22 kilometers in length and a drop in level of over 90 meters, is characterized by "the whirling rapid flow".