🧖♂️ Cave + Sauna = The Ultimate Nature Retreat in Oita, Japan
Discover Inazumi Underwater Stalactite Cave: The World’s Only Cave Sauna
Looking for a sauna experience like no other?
Welcome to Inazumi Underwater Stalactite Cave Sauna — a brand-new wellness destination in Oita Prefecture that opened in 2024.
Here, you’ll sweat it out in a rustic outdoor sauna, paddleboard (SUP) into a mystical limestone cave, and cool down in the most surreal cold plunge: a natural underwater cave.
🌿 What Makes This Sauna So Unique?
Inazumi Cave isn’t just beautiful—it’s legendary.
Originally known for its crystal-clear spring water and breathtaking stalactite formations, this natural wonder has now been transformed into an open-air sauna retreat like no other.
Here’s what makes it magical:
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✔️ Real cave as your cold plunge
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✔️ Paddleboard through limestone caverns
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✔️ Outdoor sauna cabins with views of untouched nature
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✔️ Year-round access for that perfect “totonou” moment (Japanese for the post-sauna bliss)
Imagine warming up in a wood-fired sauna, then diving into a cave lake lit by natural light. It’s not just relaxation—it’s an adventure.
📍 Location & How to Get There
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Address: 300 Nakatsuru, Mie-machi, Bungo-Ono, Oita Prefecture, Japan
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From Oita City: About 1 hour by car
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From JR Mie Station: Approx. 20 minutes by taxi
🚘 Best accessed by rental car for a smooth countryside journey.
🕒 Hours & Pricing
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Open daily: 9:00 AM – 5:00 PM (Open all year)
🔥 Pricing
Standard Outdoor Sauna
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Solo: ¥9,000
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2 or more people: ¥6,500 per person
Private Cabin Sauna
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Solo: ¥13,000
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3 or more people: ¥6,500 per person
All plans include:
✅ Sauna session
✅ Paddleboarding (SUP)
✅ Cave exploration
✅ Cold water plunge
✅ Rest & relaxation space
👉 Reservations recommended, especially on weekends.
📸 Instagrammable & Inspiring
Inazumi Cave is a dream for photographers and Instagrammers.
From the shimmering cave reflections to peaceful SUP rides and forest-surrounded saunas—every corner is a postcard.
Search #稲積水中鍾乳洞 on Instagram to see how magical this place looks through the lens.
💡 Who Will Love This Place?
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Sauna fans chasing the most epic experiences
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Nature lovers and outdoor adventurers
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Travelers seeking off-the-beaten-path destinations
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Couples or groups of friends looking for something unforgettable
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Wellness travelers and cold plunge enthusiasts
✨ Final Thoughts
The Inazumi Underwater Cave Sauna isn’t just a wellness activity—it’s a once-in-a-lifetime immersion into Japan’s natural beauty.
Between the heat of the sauna and the chill of the cave water, you’ll feel your stress melt away. It’s the kind of “totonou” (inner balance) that you’ll remember long after your trip is over.
So if you’re planning a journey through Kyushu, don’t miss this hidden gem.
