Shinshu Matsukawa Onsen Seiryuen
Matsukawa, Nagano, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Matsukawa, Nagano, Japan
- Water type
- 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
Shinshu Matsukawa Onsen Seiryuen, in Matsukawa, Nagano Prefecture, is fed by bicarbonate water at 40°C. The facility offers an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Shinshu Matsukawa Onsen Seiryuen draws softly alkaline bicarbonate water from the southern Japanese Alps in Nagano's Matsukawa valley, a region long celebrated for its fruit orchards and clean mountain air. The water has a slightly slippery feel characteristic of bicarbonate springs, which locals attribute to its skin-smoothing and fatigue-relieving properties. Seiryuen means pure-flow garden, and the outdoor rotenburo overlooks a riverine garden planted with seasonal blossoms. Spring visits coincide with cherry and apple blossom season for a particularly memorable backdrop.
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 bicarbonate water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).