Koshikawa Onsen
Shari, Hokkaido, Japan
- Location
- Shari, Hokkaido, Japan
- Water type
- sodium chloride
- Temperature
- 41 °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
Koshikawa Onsen welcomes bathers in Shari, Hokkaido Prefecture. The sodium-chloride water reaches 41°C and is split between an indoor bath and an outdoor rotenburo, alongside a sauna.
Insider tip — Shari is the gateway town to the Shiretoko Peninsula, a UNESCO World Heritage wilderness. Koshikawa Onsen lets you warm through after wildlife spotting — brown bears, sea eagles, and drift ice are the local specialties.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.