Muya, Naruto, Tokushima
Naruto Natural Onsen Aratae-no-Yu
A strong all-round day spa near the Naruto Station and expressway bus areas, with designated natural-spring baths, many other pools and saunas. Its high-concentration carbonated bath is a separate feature bath, not a natural carbonated spring.
Check before bathing
- Opening hours
- 08:00–24:00; last admission 23:00. No regular closing day is listed. Adult admission is ¥800 on weekdays and ¥1,000 on weekends and public holidays in the current Tokushima tourism listing; rates may rise during holiday periods. Towel set rental ¥350.
- Tattoo policy
- Tattoos, including tattoo stickers, are prohibited. Opposite-sex bathing is not allowed from age 7; minors under 18 without a guardian may use the facility only until 22:00.
Spring & water temperature
- Spring-source temperature
- 21.4°C.
- Bathing temperature
- Not published.
- Spring source
- Naruto Onsen source, pumped from underground.
- Spring classification
- Calcium-sodium chloride cold mineral spring; high salinity, neutral pH.
- pH
- 6.9.
- Flow rate
- 212 L/min; mechanically pumped.
- Water handling
- The operator identifies separate source-water baths for men and women. Other facilities include a high-concentration carbonated bath, pots, jet and electric baths, a cold bath and sauna. Full treatment details are not published for each source bath; do not describe all pools as source-flowing.
21.4°C is source temperature, not a fixed bath temperature. The carbonated bath is a feature bath, not a natural carbon dioxide spring.
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.
