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Known as the oldest limestone cave in Japan, its name is mentioned in the "Nihon Sandai Jitsuroku," a historical record written in 901 during the Heian period. It features a large stalagmite called "Dounai Fuji," which is 3 meters high and 5 meters in diameter, and a "Goju no To" (Five-Storied Pagoda) made up of 22 layers of stalactites. The cave maintains a low temperature of 9 degrees Celsius throughout the year. It is also designated as a natural monument of Okayama Prefecture.