aoyuan Cave National Nature Reserve
Taoyuan Cave Nature Reserve covers an area of 32,786 hectares, where exists the highest mountain in Hunan province—Ling Mountain, whose altitude is 2115.5 m and the biggest waterfall, whose fall reaches 175 m. through the examination of expert, it is the only virgin forest in Hunan province, whose area reaches 110,000 mu. Pearl Curtain Fall zone lies in here, where the negative oxygen ion is the most in the whole Asia and 98% of the area covers with forest. The population density is very low here, as low as 6.4 men per km2. And here still preserves Hakka Culture which is embodied by the architect styles.