Yilong Cave
Yilong Cave (simplified, traditional, Yìlóng Dòng, lit. 'righteous dragon cave') is a 180-million-year-old karst cave located in Pingxiang City, Jiangxi Province, People's Republic of China. Also known as Nielong Cave (/ literally evil dragon cave), the cave extends to around 4,200 m (13, 800 ft) in length. Inside there are unusual rock formations, small streams and waterfalls.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).