Yilong Cave (simplified Chinese:义龙洞;traditional Chinese:義龍洞;pinyin: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 (孽龙洞/孽龍洞 literally evil dragon cave), the cave extends to around 4,200m (13,800ft) in length. Inside there are unusual rock formations, small streams and waterfalls.

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