Senagajima, Tomigusuku, Okinawa Prefecture
Ryujin-no-Yu, Ryukyu Onsen
A strong airport-side stop if you want sea and aircraft views, a sunset soak and a sauna before or after a flight.
Check before bathing
- Opening hours
- Day admission is ¥2,000 for adults and ¥1,000 for elementary-school children, including bathing tax and consumption tax. Face and bath towels are included.
- Tattoo policy
- Not permitted. The current facility rules do not allow guests with tattoos to bathe.
Spring & water temperature
- Spring-source temperature
- Not published in the current first-party pages reviewed.
- Bathing temperature
- About 41°C in the indoor and ceramic-pot baths, as listed by the facility; this is not the source temperature.
- Spring source
- Natural spring water drawn from about 1,000 m underground on Senagajima.
- Spring classification
- Strong sodium chloride spring.
- pH
- Not published in the current material summarized here.
- Flow rate
- Not published in the current material summarized here.
- Water handling
- The current Japanese official page says the large open-air bath uses natural spring water from about 1,000 m underground. The indoor baths are separately described as using nano water, so not every pool is treated as a natural spring bath. Current text pages do not publish complete treatment conditions for each natural-spring pool, and the facility is not described as entirely source-flowing.
Bathing indications
The facility lists general bathing indications including neuralgia, muscle and joint pain, sensitivity to cold, fatigue and general health maintenance. These are not treatment guarantees.
The open-air bath uses natural spring water; the indoor baths use nano water. Pool-by-pool heating, water addition, circulation and disinfection details are not fully published.
Guests with tattoos and people who regularly use diapers may not bathe. Day admission includes a bath towel and face towel.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
