Zhongdong (Chinese: 中洞; literally: "Middle Cave") is a village in Ziyun county, Anshun prefecture in Guizhou Province, People's Republic of China. It is thought to be the only inhabited, year-round settlement in China located inside a naturally occurring cave. The limestone Zhong Cave is the largest of three local caves, set between an upper and lower cave that are uninhabited. The cave, at 1800 meters above sea level, is only accessible on foot after over an hour's hike. Some villagers claim that the village was settled after the 1949 Communist Revolution to escape banditry, while others claim that the village has been there countless generations earlier.