Yilong 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 (孽龙洞/孽龍洞 literally evil dragon cave), the cave extends to around in length. Inside there are unusual rock formations, small streams and waterfalls.
See also List of caves in China List of longest caves
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