Yakushi Onsen
- Location
- Tsumagoi, Nagano, Japan
- Water type
- bicarbonate
- Temperature
- 40 °C
- pH
- 8
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Yakushi Onsen—Medicine Buddha Spring—takes its name from Yakushi Nyorai, the Medicine Buddha whose vow to heal all sentient beings of their physical and spiritual suffering has made him the patron deity of thermal spring healing across Japan, where springs bearing his name have historically served as places of miraculous healing attributed to his divine intervention in the world of suffering. Simple alkaline waters provide the gentle, universally accessible mineral soak that most directly embodies Yakushi's healing mandate—water that welcomes and benefits all who approach regardless of the severity of their condition or the depth of their spiritual practice. This Gunma spring's Medicine Buddha name situates thermal bathing within Japan's deepest tradition of aligning geological healing with Buddhist compassion, where the volcanic earth's mineral gift is understood as a material expression of the Buddha's infinite healing vow.