Ishioka Onsen
- Location
- Ishioka, Ibaraki, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Ishioka Onsen is located in Ishioka City, Ibaraki Prefecture, in the historic Hitachi Province heartland at the foot of Mount Tsukuba — the iconic double-peaked mountain celebrated in Japan's oldest poetry anthology (Man'yoshu) as a symbol of eternal love and one of Japan's one hundred famous mountains. The siliceous thermal waters here serve a city whose historical significance as an ancient provincial center of eastern Japan is preserved in the Jinguji Temple ruins, the Kashima and Katori shrine pilgrimage routes that pass through the area, and the broad agricultural plain of the Kino River basin. Bathing at Ishioka Onsen with views toward the distinctive twin peaks of Mount Tsukuba provides a spiritually resonant and historically layered mineral spring experience in a city that connects visitors to the poetic and religious heritage of ancient eastern Japan's most celebrated sacred mountain landscape.