Surrounding lava hardened to form a hollow cavity in the middle. Inside, the air maintains a constant temperature. Locals have used the space as a natural refrigerator for storing fruits and vegetables. If you want to view the formation, you must be accompanied by a guide.
- Postal Code
- Kurisuno, Hidaka Town, Toyooka City, Hyogo Prefecture
- Hidaka Kannabe Tourism Association 0796-45-0800