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Katsuura Onsen Chiba

Katsuura, Chiba Prefecture, Japan
Katsuura Onsen Chiba
Location
Katsuura, Chiba Prefecture, Japan
Water type
sodium chloride
Temperature
41 °C
pH
7.3

Water profile

Thermicity
Sedative
41 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Restorative
LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy
Effortless float
LowHigh

Dense, salty water — you float without effort.

SodiumChloruresBrome

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.

Insider tip — Katsuura Onsen in Chiba taps into coastal sodium-chloride springs that mirror the mineral richness of the nearby Pacific. Bathers emerge with noticeably soft, warm skin, a hallmark of salt-rich Boso Peninsula waters. The local morning tuna market at Katsuura port, one of Japan largest, is a compelling reason to arrive early and combine a soak with breakfast sashimi.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).