Yu no Sato Onsen; Utopia Uwa
Seiyo, Ehime, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Seiyo, Ehime, Japan
- Water type
- thermal, bicarbonate
- Temperature
- 40 °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.
BicarbonatesSodiumCalcium
Yu no Sato Onsen; Utopia Uwa is an onsen in Seiyo, Ehime, Japan, fed by thermal bicarbonate water at 40°C. The facility offers an indoor bath, an outdoor bath (rotenburo) and a sauna for a classic Japanese bathing break.
Insider tip — 'Utopia Uwa' at Yu no Sato Onsen in Seiyo, the Uwa region of western Ehime. The Uwa basin is one of Shikoku's hidden valleys — a preserved landscape of paddy fields, traditional farmhouses, and the famous Uwa mikan groves. Bicarbonate-rich mountain spring waters in a setting that genuinely lives up to the 'utopia' name.
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 thermal & bicarbonate water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.