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Kanra Onsen Gunma

Kanra, Gunma, Japan
Kanra Onsen Gunma
Location
Kanra, Gunma, 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

Kanra, in the hilly terrain of southwestern Gunma Prefecture, is an agricultural community in the Kabra River valley whose traditional silkworm cultivation heritage, connected to the Tomioka Silk Industry legacy, supported the mulberry farming landscape of the greater Gunma silk region that was instrumental in Japan's Meiji-era industrial transformation. Kanra Onsen Gunma draws on sodium and bicarbonate thermal waters from the geothermal resources of the southern Gunma highland zone, offering restorative baths in a rural community where the silk heritage farmhouse landscape, the traditional Gunma mountain vegetable cuisine, and the forested hillsides of the Kanra basin create a quietly authentic rural spa setting in the Gunma highlands. The traditional silkworm farmhouses of the Kanra hills, the nearby Tomioka Silk Mill UNESCO heritage accessible from the Kabra River road, and the mountain scenery of the western Gunma highlands bordering Nagano create a pleasant agricultural and heritage backdrop for thermal wellness in southwestern Gunma Prefecture.

Insider tip — Kanra Onsen draws soft bicarbonate water from the foothills between the Kanna and Kabura river valleys in western Gunma. The rural landscape of persimmon orchards and traditional farmhouses frames the bathhouses in seasonal color. This lesser-visited area preserves a genuine local bathing culture unaffected by mass tourism. At 40°C, the waters are comfortable year-round and particularly restorative after cycling the surrounding agricultural roads.
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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).