Iwao Onsen; Attama-ru
Mashike, Hokkaido, Japan
- Location
- Mashike, Hokkaido, Japan
- Water type
- sodium chloride
- Temperature
- 42 °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
In a traditional Japanese onsen, bathers immerse themselves in a serene atmosphere, embracing a centuries-old cultural practice that emphasizes relaxation and purification. The bathing tradition involves a ritualistic cleansing, often preceded by a gentle scrubbing and rinsing, followed by a soothing soak in warm, mineral-rich waters. It is a deeply ingrained custom that fosters a sense of community and tranquility, allowing individuals to unwind and rejuvenate.
Insider tip — Attama-ru, meaning to get warmed through in Hokkaido dialect, perfectly describes the function of this Mashike coastal spring on the cold Japan Sea shore of Rumoi subprefecture. Mashike is home to Nihonkaisaku, one of Japan most distinctive sake breweries using Hokkaido rice and snowmelt water in a white-walled kura beside the Sea of Japan.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 42 °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.