Uchinomaki Onsen, Aso, Kumamoto
Unkai Yakushi Onsen
A compact town bath for visitors who care about spring data and a source-flowing soak more than extra facilities. Its own pages disagree on whether bathing starts at 10:00 or 12:00, and child prices also differ between current listings. Call before an early visit or when bringing children.
Check before bathing
- Opening hours
- The bathing guide lists 12:00–21:00, last reception 20:35; another section and the inn association list 10:00–21:00. Adult admission ¥400. Child prices differ across current listings, so confirm before visiting.
Spring & water temperature
- Spring-source temperature
- 44°C according to the facility.
- Bathing temperature
- Not published.
- Spring source
- Unkai Yakushi Onsen.
- Spring classification
- Sodium-magnesium-calcium sulfate spring; hypotonic, neutral and high-temperature.
- pH
- 7.34 according to the facility.
- Flow rate
- Not published.
- Water handling
- The operator describes it as source-flowing. Pool-by-pool dilution, heating, circulation and disinfection details are not published.
The operator's bathing guide says to limit each visit to 50 minutes. Opening-time and child-price listings differ; confirm directly.
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.
