ThermaeExplore the map →

Midori Onsen Gunma

Midori, Gunma, Japan
Midori Onsen Gunma
Location
Midori, 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

Midori, in the eastern Gunma Prefecture bordering Tochigi and Saitama, is a post-merger city incorporating several former communities in the lower reaches of the Watara River zone, set in the transition zone between the Kanto mountains and the broader Kanto plain where traditional Gunma silk farming landscapes blend with the suburban fringe of the greater metropolitan region. Midori Onsen Gunma draws on sodium and bicarbonate thermal waters from the geothermal resources of the eastern Gunma zone, offering restorative baths in a community that preserves elements of the traditional Gunma agricultural and silk heritage landscape on the western approaches to the Kanto plain. The Kiryugawa River valley cycling paths, the traditional silk weaving heritage of the greater Kiryushi area adjacent to Midori, and the mountain scenery of the eastern Gunma borderlands with Tochigi and Saitama create a pleasantly varied spa destination on the eastern edge of Gunma Prefecture.

Insider tip — Midori City sits at the foothills of the Akagi and Haruna volcanic massifs in western Gunma, where bicarbonate-rich groundwater percolates through ancient lava beds. The spring water here has a clean, faintly mineral taste and leaves skin refreshed rather than sulfurous. Visit in autumn when the surrounding forested ridges blaze with crimson and gold.
Find hotels nearby →Tickets & activities →See the map & practical info →

Nearby

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).