Numazu Kaigan Onsen
- Location
- Numazu, Shizuoka, 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.
Numazu Kaigan Onsen is a seaside hot spring in Numazu, a port city at the base of the Izu Peninsula in Shizuoka Prefecture, Japan, strategically positioned where Suruga Bay meets the Kano River delta and offering dramatic views of Mount Fuji across the bay's famously deep waters. The naturally chloride-sodium spring waters here are prized for their warming, skin-softening, and circulation-improving properties, offering bathers the characteristic comfort of saline coastal thermal waters beside the Pacific. Numazu's famous fresh seafood — particularly aji horse mackerel and cherry shrimp caught in Suruga Bay's deep waters — pairs perfectly with a restorative mineral soak in this welcoming bayside hot spring destination.