Inazumi Underwater Caves
A rare underwater cave offering a glimpse of submerged stalactites
Inazumi is one of Japan’s largest underwater stalactite caves, where visitors can enjoy scuba diving and snorkeling. Formed approximately 300 million years ago, the cave was submerged around 300,000 years ago during a massive eruption of Mt. Aso. Over time, erosion and excavation created pathways, allowing visitors to walk through and explore the cave. Beneath these pathways, crystal-clear water gently flows, with the cave maintaining a comfortable year-round temperature of 16°C, offering a cool retreat in summer and warmth in winter.
Two walking routes, each about 200 meters long, allow exploration of the cave’s fascinating features. Visitors can marvel at the stunning underwater stalactites, coral stones, and other natural wonders that resemble intricate works of art. In deeper sections, scuba diving and snorkeling are available, and the illuminated stalactites create a magical and otherworldly atmosphere.
There is also an outdoor sauna located near the cave entrance, the only one of its kind in an underwater stalactite cave worldwide. With prior reservations, guests can indulge in a luxurious experience by relaxing in a high-temperature sauna before cooling off in the cave’s refreshing waters.
Two walking routes, each about 200 meters long, allow exploration of the cave’s fascinating features. Visitors can marvel at the stunning underwater stalactites, coral stones, and other natural wonders that resemble intricate works of art. In deeper sections, scuba diving and snorkeling are available, and the illuminated stalactites create a magical and otherworldly atmosphere.
There is also an outdoor sauna located near the cave entrance, the only one of its kind in an underwater stalactite cave worldwide. With prior reservations, guests can indulge in a luxurious experience by relaxing in a high-temperature sauna before cooling off in the cave’s refreshing waters.
* Please note that the text shown on this page includes machine translations.
Category
Basic Information
- Address (Japanese)
- 879-7263 大分県豊後大野市三重町中津留300
- Address
- 300 Nakazuru, Mie-machi, Bungoono City, Oita, 879-7263
- Telephone Number
- 0974-26-2468
- Other contact details
- 0974-26-2469
- Opening Times
- 9:00–17:00 (extended hours during summer)
- Prices
- -Adults: 1,500 yen
-Junior high and high school students: 1,200 yen
-Children (4 years old to elementary school students): 900 yen
*Group discounts available for 20 or more people
*Discounts available for disabled individuals
*Additional fees apply for facilities like saunas and snorkeling - Car Park
- -300 parking spots for standard vehicles
-30 parking spots for buses - Access
- [By car]
-Approximately 20 minutes from JR Miemachi Station
-Approximately 60 minutes from Oita Mera IC on the Higashi-Kyushu Expressway - Website
＊Information on facilities is subject to change. Please check each official website for the latest information.
