Kamishiobara Onsen

Nasushiobara, Tochigi Prefecture, Japan

Location: Nasushiobara, Tochigi Prefecture, 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

Kamishiobara Onsen in Tochigi Prefecture flows with bicarbonate and simple thermal waters in a pastoral rural landscape situated between the Nasu volcanic highland to the north and the Nikko mountain district to the south, giving it a strategic and convenient position within Tochigi's extensive and historically rich onsen geography. The spring's dual mineral composition produces waters that combine the skin-conditioning alkalinity of bicarbonate chemistry with the gentle simplicity of lightly mineralized thermal water, making it suitable and welcoming for visitors of all ages seeking uncomplicated, restorative bathing. Kamishiobara Onsen's serene countryside setting and gently mineralized water make it a favored retreat for those who seek the quiet pleasures of unhurried immersion in naturally softened spring water amid the agricultural landscapes of former Shimono Province.

Insider tip — Kamishiobara Onsen sits in the upper Shiobara valley of Tochigi Prefecture, one of Japan's oldest and most storied spa resorts known for its tightly clustered ryokan along a narrow mountain gorge. The bicarbonate spring emerges in a landscape of beech and cedar forest, and the valley retains much of its traditional Meiji-era ambience with wooden bathhouses overhanging the clear mountain stream. Steam rises from riverside baths called kawayu where guests soak just meters from rushing water. The Shiobara valley as a whole hosts over a dozen distinct spring sources, each with slightly different mineral profiles.

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