Jonan Onsen
Ikeda, Osaka, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Ikeda, Osaka, Japan
- Water type
- thermal, sodium chloride
- 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
Jonan Onsen, in Ikeda, Osaka Prefecture, provides thermal sodium-chloride water at 38°C, along with an indoor bath, an outdoor rotenburo and a sauna for a quiet local soak.
Insider tip — 'Jonan' (south-of-the-castle) Onsen in Ikeda, northern Osaka — the city where Momofuku Andō invented instant noodles in 1958 (his original workshop is now the Cup Noodles Museum). Soak in the artesian hot spring waters and savour the area's unexpected cultural legacy.
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 thermal & sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.