Hokkawa Onsen, Higashiizu, Shizuoka Prefecture
Kuroneiwa Outdoor Bath
Go for the unusual sea-level setting and ocean view, not for a long spa session or extensive facilities. Check the weather: wind and high waves can affect a bath this close to the water.
Check before bathing
- Opening hours
- 10:00–18:00; last admission 17:45. Admission is ¥700. The two nearer rock baths are for men and the farther round bath is for women.
Spring & water temperature
- Spring-source temperature
- Not published.
- Bathing temperature
- Not published.
- Spring source
- Hokkawa Onsen; the current facility information does not name the individual source.
- Spring classification
- Not published in current first-party information.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- The facility identifies the bath as a natural hot spring but does not publish current treatment details. Older historical source-temperature figures are not treated as current measurements.
Bathing indications
No current treatment indications are confirmed.
The bath is at sea level. Check same-day weather for strong wind or high waves. Guests wearing diapers are not permitted to bathe.
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.
