Tennen Onsen Battenyu
Sasebo, Nagasaki, Japan
- Location
- Sasebo, Nagasaki, Japan
- Water type
- sodium chloride, thermal
- Temperature
- 40 °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
A small onsen in Sasebo, Nagasaki, Tennen Onsen Battenyu draws on sodium-chloride water. The water emerges at around 40°C. The site includes an indoor bath, an open-air bath (rotenburo) and a sauna. A low-key address for a relaxing moment.
Insider tip — 'Battenyu' evokes the Kyushu dialect word for 'x marks the spot' (×). A natural hot spring in Sasebo, a port city known for its Huis Ten Bosch Dutch theme park and US naval base. The warm sodium-chloride waters reflect the coastal Kyushu geology.
Nearby
Kogane to Suiso no Yu; Huis Ten Bosch Tennen Onsen
Sasebo, Nagasaki
Sasebo Onsen Nagasaki Huis Ten Bosch
Sasebo, Nagasaki
Kawatana Osaki Onsen; Shiosai no Yu
Kawatana, Nagasaki
Kawatana Onsen
Kawatana, Nagasaki (Kyushu)
Hasami Hot Spring (Hasami Onsen)
Hasami, Nagasaki
Sasebo Onsen Nagasaki
Sasebo, Nagasaki Prefecture
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 sodium chloride & thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.