Tennen Onsen; Kishapoppo
Kōshi, Kumamoto, Japan
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- Location
- Kōshi, Kumamoto, Japan
- Water type
- thermal, sodium chloride
- Temperature
- 39 °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
Tennen Onsen, including its Kishapoppo bath, is set in Kōshi, Kumamoto Prefecture. The thermal, sodium-chloride water reaches 39°C, pH 7.3. The site features an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — 'Kishapoppo' (汽車ぽっぽ — steam train puffing) at Tennen Onsen in Koshi city, Kumamoto. 'Kishapoppo' is the Japanese onomatopoeia for a steam locomotive's rhythmic puffing — a sound associated with nostalgic Showa-era Japan. The name evokes the Hohi Line (Aso volcanic route railway) that connects Kumamoto with Aso and Oita, passing through some of Japan's most dramatic volcanic scenery. A hot spring named for a steam train in a railway enthusiast's landscape has a particular Kumamoto charm.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 39 °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.