Narukami Onsen; Nana no Yu
Karatsu, Saga, Japan
- Location
- Karatsu, Saga, 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
Narukami Onsen (Nana no Yu) is located in Karatsu, Saga Prefecture, Japan. Its sodium-chloride thermal water sits around 39°C. An indoor bath, an outdoor rotenburo bath and a sauna are available on site.
Insider tip — 'Nana no Yu' (七の湯 — seven spring, or Nana's spring) at Narukami Onsen (鳴神 — thunder god) in inland Karatsu. The thunder-god name suggests a spring with a dramatic geological story — perhaps the sound of underground hot water, or the thunder-prone forested hills of inland Saga. The number seven is auspicious in Japanese culture, and seven-spring facilities often offer multiple bath varieties. This inland position contrasts with Karatsu's famous coastal ceramics and castle.
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.