Niyu Onsen Masu
Yonezawa, Yamagata, Japan
- Location
- Yonezawa, Yamagata, 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
Niyu Onsen Masu is set in Yonezawa, Yamagata Prefecture, where sodium-chloride water emerges at 41°C. An indoor bath, an outdoor rotenburo bath and a sauna round out this mountain onsen.
Insider tip — Yonezawa in Yamagata is Japan's capital of wagyu beef (Yonezawa beef) and the fief of the legendary Date clan. Niyu Onsen Masu is a local bath in a city where castle history, sake, and thermal waters form an unbeatable cultural combination.
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.