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Tsumagoi Onsen

Tsumagoi, Gunma Prefecture, Japan
Tsumagoi Onsen
Location
Tsumagoi, Gunma Prefecture, Japan
Water type
sulfurous
Temperature
44 °C
pH
6.5

Water profile

Thermicity
Sedative
44 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Bio-active
LowHigh

Rich in active gases or metals — a strong mineral character.

Buoyancy
Standard buoyancy
LowHigh

Soft water — natural, classic buoyancy.

SoufreSulfuresSulfates

Tsumagoi Onsen is located in Tsumagoi Village, Gunma Prefecture, on the Tsumagoi highland plateau — one of Japan's highest habited plateaus at over 1,000 meters elevation — where the volcanic geology of the Kusatsu volcanic system creates rich geothermal resources amid an agricultural landscape famous for its cabbage and lettuce production, which supplies much of metropolitan Tokyo's vegetable needs. The siliceous thermal waters here complement a highland community that maintains a unique dual identity as both a major vegetable-producing area and a significant hot spring and ski resort destination, with the Paladin Tsumagoi ski area providing winter sports above the onsen valleys. Bathing at Tsumagoi Onsen offers immersion in the productive and scenic highland world of the Agatsuma volcanic plateau, where agricultural vitality and thermal wellness coexist at altitude in one of Gunma's most characterful upland communities.

Insider tip — Tsumagoi Onsen nestles in a high alpine valley on the western flank of Mount Asama, where sulfurous hydrothermal activity turns the local streams a faint milky turquoise. The village has maintained its traditional character despite proximity to the Karuizawa ski resorts, with wooden bathhouses and small minshuku family inns dominating the settlement. The elevated position at roughly 1,000 meters means spectacular stargazing on clear nights after soaking.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 44 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sulfurous water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).