Isaribi Onsen Otohime no Yu
Awaashima, Niigata, Japan
- Location
- Awaashima, Niigata, Japan
- Water type
- sodium chloride, thermal
- Temperature
- 38 °C
- pH
- 7.3
Water profile
Thermicity
Neutral
LowHigh
Soothing — neither hot nor cold, perfect balance.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Isaribi Onsen Otohime no Yu is a hot spring on Awashima Island, Niigata Prefecture, Japan. Its sodium-chloride water reaches around 38°C. The bathhouse features an indoor bath, an outdoor rotenburo bath and a sauna, overlooking the Sea of Japan.
Insider tip — 'Isaribi' (fishing-boat lantern light on the sea) Onsen 'Otohime no Yu' (Princess Otohime of the deep) is on tiny Awaashima island off Niigata's coast, accessible by ferry from Iwafune. The island's maritime character is woven into the onsen's poetic name — soak while listening to the Sea of Japan's waves.
Nearby
Frequently asked questions
How hot is the water?
The water is neutral here, around 38 °C — a perfect balance, neither too hot nor too cold.
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.