Hyogo Sanda City
Natural Hot Spring Kotobuki-no-Yu in Sanda is a day-use hot spring facility located in Sanda City, Hyogo Prefecture. The three saunas—high-temperature dry, löyly salt, and barrel-shaped—quickly draw out sweat, and the two types of cold plunge baths with varying water temperatures provide a sharp finish. The final touch is the natural chloride spring that gently envelops you, relieving fatigue from the core. The facility also includes a stone sauna, gym, book lounge, and restaurant, allowing you to spend a comfortable day from morning till night.
Sodium-calcium chloride spring (hypertonic, neutral, low-temperature spring). The water has a salty film-like feel with high heat retention. By alternating between the strong salty 'strong salty bitter spring' and the indoor or pot bath, the release of sweat and warmth deepens in stages. After bathing, you won't easily get cold, and the feeling of relaxation from the core continues.
Apply salt and warm up gently with soft humid heat. The stimulation is mild, but the skin feels smooth after sweating. When inserted between high-temperature sauna sessions, it reduces the load while maintaining metabolism.
A Finnish-style dry sauna. The gentle heat emitted from the sauna stones is pleasant, and the spacious seating area allows you to relax and enjoy the sauna bath. Equipped with a TV.
A barrel sauna with a room temperature of 100°C. Self-löyly is possible. It can accommodate about 8 people, and the unique shape of the barrel sauna allows for excellent heat and steam convection. You can thoroughly face yourself in a quiet space.
Located next to the indoor sauna room, the water is constantly supplied and overflowing, ensuring excellent water quality. The temperature is an ideal 16°C, perfect for cooling down after a sauna.
A cold plunge bath located right outside the barrel sauna. The water temperature is around 11°C, making it quite cold, allowing you to quickly cool down your body heated in the 100°C barrel sauna. After the cold plunge bath, you can relax in the well-equipped outdoor air bath area.
Regular holiday: Third Wednesday
Visited by Our Editors
We actually visited in November 2025
Exceptional hot springs, sauna, cold plunge, and atmosphere — all at the highest level
Read the full review
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JAPAN'S FINEST ONSEN & SAUNA
The Finest Onsen & Sauna in Japan
57 SELECTIONS
Most of what we surveyed never even made it onto this site. This book is a further cut from what did. Our editor bathed in every onsen and sauna in it, and wrote only what they confirmed on the ground.
