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Kamaishi Restpia Onsen

Kamaishi, Iwate, Japan
Kamaishi Restpia Onsen
Location
Kamaishi, Iwate, Japan
Water type
bicarbonate
Temperature
41 °C
pH
8

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
Standard buoyancy
LowHigh

Soft water — natural, classic buoyancy.

BicarbonatesSodiumCalcium

Kamaishi Restpia Onsen is situated in Kamaishi City on the Iwate coast, a former steel city of profound industrial heritage — the site where Hashimoto Hanzaemon built Japan's first modern Western-style blast furnace in 1858 using imported technology to launch the Meiji-era industrial transformation — and a city that achieved global sporting fame when its Rugby World Cup 2019 miracle win transformed a rust-belt community in recovery from 2011 tsunami devastation into an unlikely stage for one of sport's most celebrated upset victories. The match between Ireland and Japan at Kamaishi Recovery Memorial Stadium, built on land cleared of tsunami debris, became a globally televised symbol of the city's phoenix-like rebirth and the power of sport to heal community trauma. The thermal waters here offer relaxation in a city of extraordinary industrial history and contemporary human-interest story, where the warmth of the spring mirrors the warmth of a community that has faced catastrophic loss and chosen regeneration.

Insider tip — Kamaishi, known for its storied steel-mill history and the Sanriku復興 National Park, hosts a public onsen facility where bicarbonate-rich waters emerge at 41°C from the iron-rich Kitakami uplands. The slightly alkaline water is remarkably smooth on the skin and has earned loyal patrons among the city's reconstruction workforce. A visit pairs naturally with the Kamaishi Shinto shrine perched on the rugged headland above the port.
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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 bicarbonate water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).