Otaru Onsen; Mori no Yu
Yachimata, Chiba, Japan
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- Location
- Yachimata, Chiba, Japan
- Water type
- sodium chloride, thermal
- Temperature
- 40 °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.
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Otaru Onsen, including its Mori no Yu bath, is set in Yachimata, Chiba Prefecture. The sodium-chloride, thermal water emerges at 40°C, pH 7.3. An indoor bath, an outdoor rotenburo bath and a sauna are available on site.
Insider tip — Despite the name 'Otaru', this forest spa is firmly in Chiba's rural interior — drawing dark sodium-chloride water from deep sedimentary formations typical of the Boso Peninsula. 'Mori no Yu' (forest bath) lives up to its name with woodland surroundings far removed from the Chiba coastal sprawl.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride & thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.