Yoshikawa Onsen
- Location
- Yoshikawa, Saitama, 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.
Yoshikawa Onsen provides siliceous mineral bathing in the small city of Yoshikawa in southeastern Saitama Prefecture, celebrated throughout the Tokyo metropolitan area as the 'city of catfish' (namazu no machi)—a culinary designation rooted in the rich tradition of freshwater catfish cuisine developed along the Nakagawa River and its interconnected canal systems, where catfish were a beloved and nutritious food source for Edo townspeople and continue to be served in specialist restaurants keeping the tradition alive as a regional gastronomic heritage. The thermal waters ease bathers in a city whose canals, wetlands, and freshwater fishing culture have shaped a distinctive riparian identity between the Nakagawa and Motoarakawa rivers, where the annual Yoshikawa Namazu (catfish) Festival celebrates the local fish with elaborate decorations and traditional food stalls. The catfish culinary heritage, the meandering Nakagawa riverside parks, and the warm mineral waters of this Saitama city's neighborhood onsen offer an authentically regional immersion in the fluvial food culture of Tokyo's eastern wetland hinterland.