Taiji Cave is a karst cave located on Shilong Mountain (石龙山) in Guangde County, Xuancheng City, Anhui Province, People's Republic of China, where the provinces of Jiangsu, Zhejiang and Anhui meet. Ming dynasty writer and poet Feng Menglong described the cave as one of the "Four Absolutes Under Heaven". It is also considered a primary "Place of Enlightenment" by Taoists, similar to the Bodhimanda of Buddhism. The 200-million-year-old cave is divided into dry and wet layers representing the yin and yang of Chinese philosophy.