Taian Hot Spring
Koshu, Yamanashi, Japan
- Location
- Koshu, Yamanashi, 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
Taian Hot Spring is a hot spring in Koshu, Yamanashi prefecture. Its bicarbonate water, slightly alkaline, rises at around 40°C. The bath house offers an indoor bath, an open-air outdoor bath and a sauna.
Insider tip — Taian Hot Spring sits in a forested valley of Yamanashi Prefecture near the historic Koshu wine-producing region, drawing bicarbonate-rich water that leaves skin feeling exceptionally soft. At 40°C, the clear, effervescent water carries a gentle fizzing sensation traceable to dissolved carbon dioxide and sodium bicarbonate, a combination known locally to ease digestive and skin complaints. The surrounding vineyards turn brilliant crimson in October, making an autumn soak followed by a Koshu wine tasting one of the finest day-trip combinations in greater Tokyo's hinterland. Mount Fuji is visible on clear days from the outdoor bath.
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).