Yonako Isawa Onsen
- Location
- Isawa, Fuefuki, Yamanashi, Japan
- Water type
- bicarbonate
- Temperature
- 42 °C
- pH
- 8
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Isawa Onsen is a celebrated hot spring resort in Fuefuki City, Yamanashi Prefecture, at the foot of Mount Fuji in the Kofu Basin surrounded by the peach orchards and vineyard landscapes of one of Japan's premier fruit and wine producing regions. The sulphated spring waters of the Isawa area, emerging from the volcanic and metamorphic geological basement of the Fuji volcanic field, are used in the thermal pool facilities of numerous traditional ryokan inns that serve wine country visitors, pilgrims on the Fuji climbing season, and Tokyoites seeking weekend mountain escape within 90 minutes of the capital. The Fuefuki River valley's peach and grape cultivation creates extraordinary seasonal landscapes — a pink cloud of peach blossom in April and the gold and burgundy of grape harvest in September — that frame the onsen bathing experience in a natural calendar of Japanese agricultural beauty. Isawa Onsen's position between Mount Fuji's majestic profile, Yamanashi's wine tourism infrastructure (including Japan's oldest winery, Château Mercian), and the heritage samurai town of Kofu makes it an excellent base for exploring the cultural and natural riches of Japan's Mount Fuji region.