Okuyamada Onsen
- Location
- Iizuna, Nagano, Japan
- Water type
- thermal
- Temperature
- 38 °C
- pH
- 7.3
Water profile
Soothing — neither hot nor cold, perfect balance.
Rich in trace elements — gentle on the skin.
Soft water — natural, classic buoyancy.
Okuyamada Onsen is a hot spring in the Yamada area of Nagano Prefecture, in the mountain interior of this celebrated hot spring prefecture where the volcanic activity of the Japanese Alps generates abundant geothermal resources distributed across the highland valleys and resort communities of central Honshu. Nagano Prefecture's thermal heritage encompasses a remarkable variety of spring types from the powerfully acidic Sirogane springs of the northern mountains to the gentle simple waters of many valley resorts, and the simple mineral waters of Okuyamada Onsen represent one of the quieter and more secluded bathing destinations within this rich thermal landscape. The mountain setting of the Yamada area provides the tranquil natural environment that Japanese hot spring culture prizes as an essential complement to the therapeutic waters, where the combination of clean mountain air, forested surroundings, and the warmth of the geothermal spring creates the complete restorative experience that defines the finest Japanese onsen destinations.