Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Katsuura Onsen is located in Katsuura City, Chiba Prefecture, on the Pacific Ocean coast of the Boso Peninsula where the dramatic Katsuura coast — with its natural cave tunnels, rocky shoreline, and the famous Katsuura Big Hina Festival (one of Japan's largest doll festivals) — creates a distinctive Chiba coastal tourism identity blending natural spectacle and traditional cultural celebration. The siliceous thermal waters here complement a Pacific coast setting where the powerful ocean swell, fresh seafood (particularly Katsuura's famous yellowtail and abalone), and the rugged coastal scenery of the outer Boso Peninsula define a vibrant maritime spa destination within convenient reach of metropolitan Tokyo. Bathing at Katsuura Onsen on the Pacific coast of Chiba provides an invigorating contrast between the raw energy of the open Pacific and the soothing warmth of mineral spring bathing, in a setting where ocean culture and therapeutic hot spring traditions combine in one of Tokyo's most accessible and scenically dramatic coastal getaways.