Ojima Onsen Tone no Yu
Ōta, Gunma, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Ōta, Gunma, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Ojima Onsen Tone no Yu is located in Ōta, Gunma Prefecture, near the Tone River. The sodium-chloride water reaches 41°C. It offers an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — Tone no Yu at Ojima Onsen serves Ōta City on the Tone River plain of Gunma Prefecture, the industrial heartland of the automobile industry where Fuji Heavy Industries (now Subaru) has produced vehicles since 1953. Ōta City preserves remarkable archaeological heritage in the Ojima kofun burial mound cluster along the Tone River — ancient tumuli whose excavated grave goods of iron armor, horse harnesses, and gilt bronze ornaments document the extraordinary wealth of the Gunma clan chieftains who controlled the Tone River valley trade routes in the 5th and 6th centuries.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.