Nagayu Onsen; Naga no Yu
Taketa, Oita, Japan
- Location
- Taketa, Oita, Japan
- Water type
- carbonated, bicarbonate
- Temperature
- 33 °C
- pH
- 6.3
Water profile
Thermicity
Invigorating
LowHigh
Stimulating — wakes the body and boosts circulation.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
High buoyancy
LowHigh
Mineralised water — eases movement and joints.
CO2BicarbonatesMagnésium
Nagayu Onsen, also known as Naga no Yu, is located in Taketa, Oita Prefecture. This bicarbonate, carbonated spring runs cooler, around 33°C, with an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — 'Naga no Yu' (長の湯 — long bath) at Nagayu Onsen in Taketa — one of the world's most remarkable hot springs, celebrated for its extraordinary CO2 concentration, among the highest of any natural spring globally. The sparkling, naturally carbonated water at just 30-34°C is deceptively powerful: CO2 promotes vasodilation, improving circulation dramatically and creating a warming sensation despite the low temperature. The tradition is to soak for a very long time (hence 'Naga' = long), emerging from what feels like a gentle soak with profoundly improved cardiovascular function. German spa physicians call this 'Kohlensäurebad' — carbonated mineral bathing.
Nearby
Frequently asked questions
How hot is the water?
The water is on the cooler side here, around 33 °C — an invigorating water that boosts circulation.
What type of water is found here?
This spot features carbonated & bicarbonate water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.