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Kamaishi Onsen

Kamaishi, Iwate, Japan
Kamaishi Onsen
Location
Kamaishi, Iwate, Japan
Water type
bicarbonate
Temperature
40 °C
pH
8

Water profile

Thermicity
Sedative
40 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Restorative
LowHigh

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

Buoyancy
Standard buoyancy
LowHigh

Soft water — natural, classic buoyancy.

BicarbonatesSodiumCalcium

Kamaishi Onsen is situated in Kamaishi, an Iwate coastal city with a remarkable dual legacy as both a historic center of Japanese iron and steel manufacturing — Kamaishi's blast furnaces in the Meiji era were the first Western-style steel production facilities in Japan, making the city a pioneer of Japan's industrialization — and as a community that suffered devastating losses in the 2011 Tōhoku earthquake and tsunami before demonstrating an extraordinary collective resilience in rebuilding that has made Kamaishi an international symbol of disaster recovery and community strength. The city's 'Kamaishi Miracle' — the successful evacuation of nearly all schoolchildren through rigorous disaster education programs — was one of the most celebrated stories to emerge from the 2011 disaster, and the city hosted Rugby World Cup 2019 matches as part of its revival story. The onsen here provide mineral bathing in a community whose spirit of endurance and renewal has given it a significance far beyond its size.

Insider tip — Kamaishi Onsen sits in the coastal city of Kamaishi on the Sanriku Rias Coast, where steep forested valleys plunge to the Pacific Ocean. The bicarbonate-mineralized waters emerge from Paleozoic rock formations exposed by the deeply eroded coastline. Kamaishi is also celebrated for its Rugby World Cup legacy and ironworks history, giving the hot spring visit an added cultural dimension. Fresh seafood from the fishing port completes the post-soak evening.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features bicarbonate water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).