Yunohama Onsen
- Location
- Tsuruoka, Yamagata, Japan
- Water type
- sodium chloride
- Temperature
- 42 °C
- pH
- 7.4
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Yunohama Onsen faces the Sea of Japan on the Shonai coast of Tsuruoka City, Yamagata, earning a place among the celebrated Ouuu Sanrakukyo—the Three Pleasure Resorts of the Ou region—alongside Kaminoyama Onsen in Yamagata and Higashiyama Onsen of Aizu, a designation that recognized the finest thermal resort experiences of Japan's historic Tohoku region. This seaside position gives Yunohama a distinctive character among Japanese onsens, where thermal waters are enjoyed with views of the open ocean and the particular luminous quality of the Japan Sea horizon at dusk. The spring has served Shonai travelers and Tsuruoka residents for generations, combining coastal beauty with the deep restoration of mineral thermal bathing.