Hoyo Onsen; Kyoyu
Kirishima, Kagoshima, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Kirishima, Kagoshima, 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
Hoyo Onsen (Kyoyu) is a hot spring in Kirishima, Kagoshima Prefecture, Japan. Its sodium-chloride thermal water sits around 40°C. Visitors to this volcanic region can use an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — 'Kyoyu' (共湯 — shared/communal bath) at Hoyo Onsen in Kokubu, Kirishima city. 'Hoyo' (保養 — wellness/recuperation) designates a facility maintaining wellness bathing standards under Japanese hot spring law. The 'kyoyu' communal bath format is among Japan's oldest bath traditions — the shared bath as social equaliser, where hierarchy dissolves in warm water. In the Kokubu plain, Kirishima's volcanic geothermal energy reaches well into the populated lowlands.
Nearby
Oshokujidokoro Issa; Issa Onsen
Kirishima, Kagoshima
Kazoku Furo; Shigehisa Onsen (Coords Unclear)
Kirishima, Kagoshima
Kazoku Onsen; Ki no Hana
Kagoshima City, Kagoshima
Iyashi no Yu Kazoku Onsen; Sansui
Kirishima, Kagoshima
Kazoku Yu; Shin Amorigawa Onsen
Kirishima, Kagoshima
Kokubu Shimin Pool Koen; Fureai Onsen Center
Kirishima, Kagoshima
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.