Feel totonou in a strongly alkaline pH9.1 skin-beautifying bath
Tochigi Otawara City
Ohtawara Onsen Taiyo no Yu is a day-use hot spring facility attached to Hotel Ryujouen, boasting an impressive volume of hot spring water. The sodium chloride spring gushing up from underground has a high alkalinity of pH9.1, and it is beloved as a skin-beautifying bath that helps remove old dead skin cells and leaves the skin smooth. It also features a sauna and a cold plunge bath. Along with the outdoor bath filled with the scent of hinoki, it is a soothing base where you can fully enjoy authentic hot spring water and sauna.
TypeNatural Hot Spring
A strongly alkaline sodium chloride spring with a pH9.1 that gushes up from underground. The abundant hot spring water is renowned as a skin-beautifying bath that leaves the skin smooth, and your skin stays hydrated even after bathing. The salt-containing water has a strong warming effect, letting you feel warmth all the way to your core. In the hinoki outdoor bath, you can enjoy a luxurious soak while gazing at the sky over Ohtawara.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity12people
A spacious dry sauna wrapped in the warmth of wood. The steady heat released from the convection stove circulates efficiently throughout the room, encouraging deep sweating in a short time. With generous seating, it is a full-fledged space where you can work up a sweat at your own preferred level of heat. It offers an ideal environment for sauna lovers who want to reset the fatigue of daily life and refresh both body and mind.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A cold plunge bath using fresh natural spring water pumped up from underground, lavishly poured in a continuous flow. The water’s gentle, mellow feel is characteristic of underground water, and it quickly and pleasantly cools down a body heated by the sauna.
Closed Days: None
324-0062 Tochigi Prefecture, Ohtawara City, Nakatawara 593-3
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more
Feel totonou in a strongly alkaline pH9.1 skin-beautifying bath
Tochigi Otawara City
Ohtawara Onsen Taiyo no Yu is a day-use hot spring facility attached to Hotel Ryujouen, boasting an impressive volume of hot spring water. The sodium chloride spring gushing up from underground has a high alkalinity of pH9.1, and it is beloved as a skin-beautifying bath that helps remove old dead skin cells and leaves the skin smooth. It also features a sauna and a cold plunge bath. Along with the outdoor bath filled with the scent of hinoki, it is a soothing base where you can fully enjoy authentic hot spring water and sauna.
TypeNatural Hot Spring
A strongly alkaline sodium chloride spring with a pH9.1 that gushes up from underground. The abundant hot spring water is renowned as a skin-beautifying bath that leaves the skin smooth, and your skin stays hydrated even after bathing. The salt-containing water has a strong warming effect, letting you feel warmth all the way to your core. In the hinoki outdoor bath, you can enjoy a luxurious soak while gazing at the sky over Ohtawara.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity12people
A spacious dry sauna wrapped in the warmth of wood. The steady heat released from the convection stove circulates efficiently throughout the room, encouraging deep sweating in a short time. With generous seating, it is a full-fledged space where you can work up a sweat at your own preferred level of heat. It offers an ideal environment for sauna lovers who want to reset the fatigue of daily life and refresh both body and mind.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A cold plunge bath using fresh natural spring water pumped up from underground, lavishly poured in a continuous flow. The water’s gentle, mellow feel is characteristic of underground water, and it quickly and pleasantly cools down a body heated by the sauna.
Closed Days: None
324-0062 Tochigi Prefecture, Ohtawara City, Nakatawara 593-3
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more