Nyu-no-Kawa Onsen, Ryujin, Tanabe, Wakayama
Niu Yamasemi Onsen Hall
Yamasemi is for drivers who specifically want a quieter forest-park setting and a different spring from Ryujin Onsen proper. Its limited and changing schedule makes it a poor choice without a same-day confirmation.
Check before bathing
- Tattoo policy
- The current first-party material checked does not state a tattoo policy. Ask before bathing.
Spring & water temperature
- Spring-source temperature
- 28.3°C
- Bathing temperature
- Not published
- Spring source
- Nyu-no-Kawa Onsen, a separate source system from Ryujin Onsen proper
- Spring classification
- Alkaline simple spring (alkaline, low-tonicity, low-temperature spring)
- pH
- The Association describes the water as close to pH 10; no exact figure is published
- Flow rate
- 117 L/min
- Water handling
- The Onsen Association lists a combination of circulation filtration and free-flowing water, with no added water. Heating is used to maintain a comfortable temperature, and sodium hypochlorite is used for sanitation. The bath is cleaned daily.
Bathing indications
The official pages list general bathing indications by spring type. These are not treatment guarantees.
The standard April–October schedule is superseded by the March 30, 2026 limited-hours notice unless a newer notice says otherwise. The latest checked written notice limited opening to Fridays, Saturdays, Sundays and public holidays; September resumption was unconfirmed. Prices conflict at ¥700 and ¥800 for adults. Confirm hours and admission directly before travelling.
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.
