Shiotsubo Onsen

Nagano, Nagano, Japan

Location: Nagano, Nagano, 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

Shiotsubo Onsen is a hot spring in Nagano Prefecture, in the alpine heartland of central Honshu where the volcanic activity of the Japanese Alps generates abundant geothermal resources distributed across the mountain valleys and highland communities of this celebrated hot spring prefecture. Nagano's thermal bathing heritage encompasses springs from the dramatic volcanic caldera of Norikura to the highland resorts of the Kiso Valley and the mountain towns of the Chino and Suwa basins, and Shiotsubo Onsen represents one of the many distinct spring sources that collectively define the rich thermal character of this mountain prefecture. The mineral waters of Shiotsubo Onsen provide therapeutic bathing in the mountain environment that has made Nagano one of the most valued destinations in Japan for those seeking the combination of alpine natural beauty and genuine hot spring wellness tradition.

Insider tip — Shiotsubo Onsen in the Nagano highlands taps into a classic bicarbonate spring, the water type most associated with smooth skin and gentle detoxification. At coordinates placing it near the Ueda basin, this spring likely draws from deep Neogene aquifers mineralizing through ancient limestone. The surrounding landscape of terraced rice fields and chestnut forests typifies inland Nagano's agricultural beauty. Early morning baths here, before the valley mist clears, offer a meditative quality unique to high-altitude Japanese mountain springs.

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