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Minami Uonuma Onsen

Minami-Uonuma, Niigata (Chubu), Japan
Minami Uonuma Onsen
Location
Minami-Uonuma, Niigata (Chubu), 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

Minami Uonuma Onsen serves the administrative center of a region whose primary identity is the production of Uonuma Koshihikari — universally acknowledged as Japan's most premium Koshihikari variety, whose combination of mountain snowmelt water, temperature differential growing conditions, and the particular clay-rich soils of the Uonuma valley floor produces rice of exceptional stickiness, sweetness, and aroma that is distributed in limited quantities to high-end Japanese restaurants and food retailers who market its provenance as specifically and seriously as European wine producers market their appellations. The surrounding ski resorts — Kagura, Naeba, Joetsu Kokusai — make Minamiuonuma one of Japan's major winter sports destinations, its mountains receiving some of the world's heaviest snowfall and providing conditions that attract skiers and snowboarders from Japan and internationally throughout the winter season. The onsen's siliceous geothermal mineral waters, drawing warmth from the geological foundations of a valley famous for the quality of everything it produces — whether rice, snow, or mineral spring — provide therapeutic bathing of the kind that perfectly complements both the outdoor exertion of mountain skiing and the patient agricultural rhythms of Japan's snow-country rice culture.

Insider tip — Minami Uonuma Onsen occupies the broad valley floor between the Echigo Mountains and the Mikuni Range in southern Niigata, a landscape defined by deep winter snows and extraordinary rice cultivation. Bicarbonate waters rise through alluvial sediments deposited by millennia of snowmelt, carrying minerals leached from the surrounding mountains. The region is home to Naeba ski resort, and many visitors combine skiing with a thermal soak in the same day. The onsen facilities here blend seamlessly with the outdoor recreation culture that defines this corner of Snow Country.
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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).