Overview
Situated within Joshin'etsu-Kogen National Park, Manza Onsen is the highest hot spring resort in Japan accessible by car year-round (1,800m). Its history dates back to the late Edo period when it was known as a place for hot spring cures (toji). The name "Manza" is said to mean a place large enough for many people to sit, or a gathering place for deities.
Characterized by its abundant flow, gushing over 5.4 million liters per day, many inns offer baths fed directly from the source (gensen kakenagashi). The milky-white water, filled with the scent of sulfur, visually promises rich therapeutic benefits. Its water quality, with one of the highest sulfur concentrations in the country, continues to fascinate visitors.
Typical Spring Quality and Indications
The main spring types are "Acidic springs," known for their strong sterilizing effects, and "Sulfur springs," considered beneficial for lifestyle-related diseases and skin conditions. The sulfur content is particularly noteworthy, being the highest in Japan, which gives the water its characteristic smell and milky appearance. It is also said to have skin-beautifying effects.
- Atopic dermatitis
- Psoriasis vulgaris
- Chronic eczema
- Impaired glucose tolerance (diabetes)
- Hypercholesterolemia
- Rheumatoid arthritis
- Peripheral circulatory disturbance
- Sensitivity to cold
Water Characteristics and Best Season
The source temperature is very high, around 80°C (176°F), so most facilities cool the water to a suitable temperature, either naturally or by adding fresh water. You can enjoy constantly fresh water as it flows directly from the source. Due to its strong acidity, it's recommended to remove metal accessories before bathing to prevent discoloration.
While enjoyable year-round, the autumn season with its colorful foliage and winter with its "yukimi-buro" (snow-viewing open-air baths) are especially popular. However, be sure to check access information in winter as some roads may be closed.
Access
Facilities with Analysis Reports
No facilities with registered analysis reports in this area yet.
Facilities Without Analysis Reports
Nearby Sightseeing & Local Cuisine
- Karabuki (volcanic gas vents)
- Manza Highway (scenic road)
- Shiga-Kusatsu Kogen Route (scenic road, closed in winter)
- Mt. Shirane (Yugama Crater Lake) Access may be restricted due to volcanic activity
- Cabbage fields of Tsumagoi Plateau
- Aisai no Oka (Beloved Wife's Hill)
- Onioshidashi Park (volcanic park)
- Amanatto (sugared beans) made from Hana-ingen beans
References
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