Iimori; Tsuki no Oka Onsen
Isahaya, Nagasaki, Japan
- Location
- Isahaya, Nagasaki, 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
Tsuki no Oka Onsen, also known as Iimori, is a bathhouse in Isahaya, Nagasaki Prefecture. The sodium-chloride water emerges at 39°C. An indoor bath, an outdoor rotenburo bath and a sauna round out the facilities.
Insider tip — 'Tsuki no Oka Onsen' (月の丘 — moon hill) at Iimori in Isahaya city, Nagasaki. Isahaya is at the heart of the Ariake Sea reclamation controversy — the Isahaya Bay tidal embankment (1997) closed 3,500 ha of tidal mudflats, devastating the local fishing industry in a conflict still unresolved. 'Moon hill' evokes the poetic, reflective quality of the elevated onsen position above the bay. The thermal waters carry the alkaline volcanic character of the Unzen geothermal system close by.
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.