Mie Iga Onsen Iga
- Location
- Iga, Mie, Japan
- Water type
- bicarbonate
- Temperature
- 42 °C
- pH
- 8
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Mie Iga Onsen Iga is a traditional hot spring facility in Iga, a city straddling the border of Mie and Nara prefectures in Japan, historically celebrated as the birthplace of the Iga-ryū school of ninjutsu — one of Japan's two most famous ninja traditions — and home to the Iga Ninja Museum, Iga Ueno Castle, and the annual ninja festivals that bring this martial arts heritage vibrantly to life. The bicarbonate-rich spring waters carry the gentle alkaline mineral character prized in Japanese onsen culture for their skin-softening and restorative properties, perfectly suited to unwinding after exploring Iga's samurai castle and ninja labyrinthine lanes. The extraordinary combination of living ninja heritage, a magnificent hilltop castle, and genuine therapeutic hot spring waters makes Mie Iga Onsen one of Japan's most characterful and culturally immersive thermal destinations.