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Yasuda Onsen

Yasuda, Kochi, Shikoku, Japan
Yasuda Onsen
Location
Yasuda, Kochi, Shikoku, 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

Yasuda Onsen serves a small coastal community in the northern Aki district of Kochi Prefecture, where the Yasuda River meets the Pacific in a small bay sheltered by forested headlands characteristic of the rugged eastern Kochi coast — a landscape alternating between dramatic rocky promontories and sheltered fishing harbors that has sustained maritime communities for centuries along this stretch of the Tosa Bay shoreline. The Yasuda area's relationship with the sea is expressed through its fishing traditions, its association with traditional Tosa cuisine — particularly the katsuobushi dried bonito and fresh katsuo tataki for which Kochi is famous throughout Japan — and the Pacific-facing character of a community that lives with the sounds and rhythms of the open ocean. The onsen's siliceous mineral waters, drawing from the geothermal resources of the coastal Kochi highlands, provide restorative bathing in a seaside community whose modest size belies the depth of its connection to both the land and the Pacific waters that define its horizon.

Insider tip — Yasuda Onsen sits in the Yasuda River valley of Kochi Prefecture, a landscape of terraced yuzu orchards and old-growth cedar that typifies inland Shikoku. The soft bicarbonate water feels almost silky on the skin, a characteristic of the geology filtering through the Chichibu belt formations beneath the valley. The town is small and rarely crowded, offering an authentic rural onsen experience without souvenir shops. Come in late October when the surrounding mountains shift to gold and russet.
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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).