Sky gate cave is the highest natural mountain cave in the world. In the sixth year of wu yongan in The Three Kingdoms (263 AD), the cliffs of songliang mountain exploded open.The gate is 131.5 meters high, 57 meters wide and 60 meters deep.
Hunan is a province of the People's Republic, is located south of the Yangtze River. Most areas in the south of Dongting Lake, hence the name Hunan. Xiangjiang River runs through the territory of North and South, also known as Xiang. According to legend, the Xiangjiang River in the past few plant hibiscus, Tan Tang Dynasty poet used the "Autumn Hibiscus country thousands of miles" of the sentence, Hunan, it has "Hibiscus country, "said. Hunan, Jiangxi east, west, Chongqing, Guizhou, southern border of Guangdong, Guangxi, Hubei Province north. Jurisdiction of 13 prefecture-level cities and 1 autonomous prefecture, a total of 136 counties (county-level cities or municipal districts) or more administrative units, the provincial capital of Changsha City based.