Overview
Shima Onsen has a long history, with legends of the Heian period general Sakanoue no Tamuramaro bathing here. The name of the onsen town is said to come from a divine message in a dream, promising a "miraculous spring that cures 40,000 ailments," and it has long been cherished as a place for therapeutic bathing (toji).
In 1954, its excellent water quality and rich natural environment were recognized, and it was designated as one of Japan's first "National Hot Spring Health Resorts," along with Sukayu Onsen in Aomori and Nikko Yumoto Onsen in Tochigi. This designation is a national recognition of Shima Onsen's contribution to public health and wellness.
Signature Spring Quality & Indications
The primary spring quality at Shima Onsen is "Sulfate Spring." The water is clear, colorless, and gentle, praised as being "good for the stomach if you drink it, and good for the skin if you bathe in it." It is particularly known as a "bijin-no-yu" (beauty-enhancing spring) for its expected effects of moisturizing the skin and improving blood circulation. Drinking fountains are available, allowing you to enjoy the onsen's benefits from the inside out.
- Cuts
- Poor peripheral circulation
- Sensitivity to cold
- Dry skin
- Reduced gastrointestinal function
Water Characteristics & Best Season
Shima Onsen has over 40 hot spring sources, many of which are naturally free-flowing. Water temperatures vary by source, but many inns offer "gensen kakenagashi" baths, where the pure spring water is used without adding cold water or reheating. The soft, gentle water is ideal for long, relaxing soaks.
While beautiful in all four seasons, Shima Onsen is especially recommended in early summer (May-June) for its brilliant fresh greenery and in autumn (late Oct-early Nov) when the valleys are ablaze with fall colors. A tranquil bath surrounded by a winter snowscape also offers a uniquely atmospheric experience.
Access
Facilities with Analysis Reports
No facilities with registered analysis reports in this area yet.
Facilities Without Analysis Reports
Sightseeing & Local Cuisine
- Okushima Lake: The mystical "Shima Blue" color of this dam lake is a must-see.
- Shima no Oketsu-gun: Potholes carved by the clear stream, designated a Natural Monument of Japan.
- Sekizenkan: A historic inn with an iconic red bridge. Its main building is a prefectural Important Cultural Property.
- Hinatami Yakushido: A temple connected to the founding legend of Shima Onsen, designated a national Important Cultural Property.
- Koizumi Falls & Maya Falls: Beautiful waterfalls easily accessible by a short walk from the onsen town.
- Yakimanju: A Gunma specialty of grilled buns coated with a sweet miso sauce.
- Onsen Manju: The classic steamed buns, a perfect treat in a hot spring town.
- Local Soba Noodles: Flavorful noodles made with pure, local water.
References
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