Ishigaki Island's largest cavern created by nature over the course of 200,000 years. The natural world of stalactites, as well as the fantastic radiance of the cave cave illuminations, the water caves that enjoy the sound of dripping water, and the stalactites of Totoro, the world that spreads to the ground is full of highlights. The huge underground space, colored with countless stalactites, is just like a palace. Inside the cave, fossils such as giant clam are also found, telling us that they were on the ocean floor.