Komakusa no Yu
Komagane, Nagano, Japan
- Location
- Komagane, Nagano, 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.
SodiumChloruresBrome
Komakusa no Yu, in the town of Komagane, Nagano Prefecture, taps sodium-chloride thermal water at 40°C, with an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Komagane is the base for the Central Alps Ropeway — which ascends to the Senjojiki Cirque at 2,612 meters, a glacial bowl ringed by jagged peaks of the Kiso Mountains where komakusa (Dicentra peregrina), the queen of alpine flowers, blooms pink against the bare rock in summer. The onsen is named for this delicate flower — a perfectly fitting tribute to the mountain landscape above. Ride the ropeway at dawn for the finest light on the cirque walls, then descend to soak in Komakusa no Yu.
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.