Harunako Onsen

Takasaki, Gunma, Japan

Location: Takasaki, Gunma, Japan
Water type: thermal, sodium chloride
Temperature: 39 °C
pH: 7.3

Water profile

Thermicity

Sedative

39 °C

LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation

Restorative

LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy

Effortless float

LowHigh

Dense, salty water — you float without effort.

SodiumChloruresBrome

Tucked away in Takasaki, Gunma, Harunako Onsen draws on naturally heated thermal sodium-chloride water at 39°C. Visitors will find an indoor bath, rotenburo and sauna.

Insider tip — Harunako Onsen is situated near Lake Haruna (榛名湖) — a volcanic crater lake high on Mt. Haruna in Gunma. The mountain's volcanic geology supplies warm artesian waters. Combine a visit with the Haruna Shrine, which clings dramatically to a volcanic rock formation above the lake.

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Nearby

Ikaho Onsen

Gunma Haruna

Garameki Onsen

Agatsuma, Gunma, Japan

Kurabuchi Onsen

Kurabuchi / Mont Haruna, Gunma, Japon

Azuma Onsen; Kikyokan

Higashiagatsuma, Gunma

Shibukawa Ikaho Onsen

Shibukawa Gunma

Shinto Onsen; Fureaikan

Shinto-mura, Gunma

Frequently asked questions

How hot is the water?

The water runs quite hot here, around 39 °C — a sedative water that brings immediate muscle release.

What type of water is found here?

This spot features thermal & sodium chloride water.

What is the best season to visit?

The most favourable period for this spot is: Toute l'année.