Iruma Onsen Saitama
- Location
- Iruma, Japan
- Water type
- bicarbonate, sodium chloride
- Temperature
- 41 °C
- pH
- 8.7
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Iruma Onsen Saitama is a natural hot spring in Iruma, a city in the western part of Saitama Prefecture, Japan, home to the Japan Air Self-Defense Force Iruma Air Base — which hosts one of Japan's largest aviation shows — and situated in the historic Sayama tea-growing area where Sayama-cha, one of Japan's three most prized regional teas, has been cultivated since the Kamakura period. The naturally bicarbonate-chloride spring waters here combine alkaline digestive-supportive and skin-softening benefits with the warming circulation properties of chloride-sodium minerals, providing Iruma's residents with a well-rounded therapeutic bathing experience. Combining world-class military aviation heritage, the refined tea culture of the Sayama highlands, and the comprehensive mineral wellness of natural bicarbonate-chloride hot spring bathing, Iruma Onsen offers a characterfully local and therapeutically rich Saitama experience.