Cosmos Onsen
Kobayashi, Miyazaki, Japan
- Location
- Kobayashi, Miyazaki, Japan
- Water type
- thermal, sodium chloride
- 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
Cosmos Onsen is located in Kobayashi, Miyazaki Prefecture. The thermal, sodium-chloride water flows at 40°C, pH 7.3. The facility offers an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — 'Cosmos Onsen' in Kobayashi city, Miyazaki — Japan's cosmos flower capital. Each October, the hillsides around Kobayashi transform into seas of pink and purple cosmos (Cosmos bipinnatus), drawing visitors from across Kyushu to the 'Cosmos Road' drives through the Kirishima highland margins. The cosmic imagery (both flower and universe) fits Kobayashi's volcanic skyline — the Kirishima chain's peaks rising above the cosmos fields toward a sky as vast and star-scattered as the flowers below.
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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 thermal & sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.