Miyama Onsen
- Location
- Ogano, Saitama, Japan
- Water type
- sulfurous
- Temperature
- 44 °C
- pH
- 6.5
Water profile
Relaxing — deep, immediate muscle release.
Rich in active gases or metals — a strong mineral character.
Soft water — natural, classic buoyancy.
Miyama Onsen—Deep Mountain Spring—rises in the Chichibu mountain area of Saitama Prefecture, served by the Seibu Railway network that connects this deep mountain retreat to the urban environment of greater Tokyo within a comfortable day-trip distance, making it one of the most accessible of Japan's genuinely deep-mountain sulfurous spring experiences for the metropolitan population. The sulfurous waters carry the volcanic potency of the Chichibu mountain geology—a region of considerable geological complexity where the collision zone between tectonic plates has created a landscape of ancient rocks, deep river gorges, and scattered thermal activity of unexpected intensity for a prefecture so close to Japan's capital. Bathing in sulfurous waters within the deep Chichibu mountain forest represents a genuine wild-landscape thermal experience available to Tokyo residents without the need for overnight travel.