Oshima Island Onsen
Tokyo, Japan
- Location
- Tokyo, Japan
- Water type
- bicarbonate, silica
- Temperature
- 44 °C
- pH
- 8
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SiliceSodiumVolcanic mineralsPotassium
Located east of Tokyo on Oshima Island, Oshima Island Onsen is a unique thermal destination offering a relaxing soak in its bicarbonate and siliceous waters. Rich in minerals, the spring water is part of a long thermal tradition, inviting comfort for skin and muscles. Visitors can unwind in the natural hot springs or enjoy other spa treatments. The onsen's serene atmosphere makes it an ideal escape from the city.
Insider tip — Treat yourself to a thermal break at Oshima Island Onsen, where the bicarbonate water reaches 44°C.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 44 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features bicarbonate & silica water.
What is the best season to visit?
The most favourable period for this spot is: Mars|Avril|Mai|Septembre|Octobre|Novembre|Décembre|Janvier|Février.