Zoshiki, Ota, Tokyo
Natural Onsen Nuland Sagamiyu
A natural black-water bath with outdoor bathing, sauna and a second-floor dining and rest area. On Tuesdays, the first-floor bath and sauna can still be used, but the upstairs services are closed.
Facility photos
Check before bathing
- Opening hours
- Bathing 10:00–23:00. Admission: ¥600 for a bath, ¥750 for a hands-free set and ¥900 for the sauna set. Full-facility admission is ¥1,250 on weekdays and ¥1,550 on weekends and public holidays; an evening full-facility rate from 18:00 is listed at ¥1,000. The profile notes parking rules vary between current pages, so confirm on arrival.
- Access
- About a 3–5-minute walk from Keikyu Zoshiki Station. Around 18 parking spaces are listed; complimentary-parking terms vary by plan and should be checked at the front desk.
- Tattoo policy
- Third-party reports conflict, and current official-level pages do not state a clear rule. Call ahead if tattoo access is essential.
Spring & water temperature
- Spring-source temperature
- 22.3°C in a dated field-analysis transcription from 2026-05-30; the operator's current text page does not publish a new analysis sheet.
- Bathing temperature
- Not published as a fixed value. Visitor observations around 40°C are visit-specific, not a guaranteed setting.
- Spring source
- Sagamiyu.
- Spring classification
- Sodium bicarbonate cold mineral spring; low-salinity and weakly alkaline.
- pH
- About 8.2 in the 2026-05-30 transcription; not published on the current operator text page.
- Flow rate
- About 180 L/min in the 2026-05-30 transcription; older records differ.
- Water handling
- Natural black water is used in the large indoor pool and outdoor pool. A 2018 analysis transcription records added water, heating, circulation filtration and chlorine treatment; current pages do not republish a pool-by-pool treatment table, so the facility should not be described as entirely untreated source flow.
The source is a cold mineral spring and the bathing pools are heated. Do not apply the facility's earlier circulating-water conditions as a current pool-by-pool guarantee.
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.
