Nishiyama Onsen Sanson Koen; Seizanso
- Location
- Nishiaizu, Fukushima Prefecture, Japan
- Water type
- bicarbonate, carbonated, calcium-rich
- Temperature
- 42 °C
- pH
- 6.3
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Mineralised water — eases movement and joints.
Nishiyama Onsen Sanson Koen Seizanso is a thermal hotel in the Nishiyama district of Yamanashi Prefecture, offering bicarbonate, carbonated, and calcium-rich hot spring waters in a mountain setting at the foot of the Southern Japanese Alps, whose volcanic geology supplies the area's geothermal springs with an exceptional mineral diversity. The 'Sanson Koen' (mountain village park) component of the name reflects the forested, natural landscape surrounding the facility, while 'Seizanso' (green mountain lodge) evokes the traditional Japanese aesthetic of a retreat harmoniously embedded within its natural environment, designed to make guests feel as much a part of the mountain as they are guests within it. The mineral composition of the waters — calcium, carbonation, and bicarbonate — makes this onsen resort a destination for those seeking both alpine scenic beauty and the restful pleasures of Yamanashi's remarkable geothermal heritage, within a long thermal tradition associated with well-being.