Five Distinct Areas Along the Mountain Valley
Shima Onsen is traditionally divided into five areas, following the river from upstream to downstream: Hinata-mi, Yuzuriha, Arayu, Yamaguchi, and Onsen-guchi.
Each area has its own character. Visitors can find traditional wooden inns, modern hotels, quiet mountain scenery, historic bathhouses, and small streets where the atmosphere of an old Japanese hot spring town remains strong.
Walking through the different districts is one of the best ways to appreciate the changing character of Shima Onsen.
Shima Onsen’s Hot Spring Waters
The hot spring water is classified as a sodium-calcium chloride-sulfate spring and is generally described as a neutral, low-osmotic-pressure, high-temperature spring. The natural sources range from approximately 43°C to 82°C, and the area is blessed with abundant spring water.
Many of the springs emerge naturally from the ground, with the total volume reaching approximately 3,500 liters per minute.
Historically, the waters have been associated with bathing for conditions such as digestive disorders, neuralgia, rheumatism, and certain skin problems. Shima is also sometimes called a “beauty hot spring” because of its reputation for leaving the skin feeling soft and refreshed after bathing.
These traditional descriptions reflect the cultural history of Japanese hot spring bathing rather than modern medical treatment, but they help explain why Shima has attracted visitors for centuries.
Drinking Springs, Foot Baths, and Public Bathhouses
Shima Onsen offers more than bathing. Visitors can also experience the traditional practice of onsen drinking, known as insen. Drinking hot spring water was historically believed to be beneficial for digestion, and several drinking fountains remain available today.
Free foot baths can also be found in the Hinata-mi, Yuzuriha, and Yamaguchi districts. They are a convenient way to enjoy the warmth of the hot spring water while taking a break from sightseeing.
Three Free Public Bathhouses
Three small public bathhouses—Gomuso-no-Yu, Kawara-no-Yu, and Ue-no-Yu—offer an especially traditional bathing experience. These simple facilities can be used for a small voluntary contribution, known in Japan as shishū.
The modest bathhouses preserve the atmosphere of the old toji tradition, in which people stayed at hot spring resorts for extended periods to rest and recuperate.
For travelers looking for a more spacious facility, the municipal Shima Seiryū-no-Yu day-use hot spring is another popular option.
Beautiful Scenery Through the Four Seasons
Spring — Wild Mountain Vegetables and Fresh Greenery
Spring brings fresh green leaves to the surrounding mountains, while wild mountain vegetables such as warabi bracken and zenmai royal fern begin to appear.
The sound of kajika frogs along the river and the contrast between clear skies and newly emerging foliage make spring an especially pleasant season for walking.
Summer — Cool Mountain Air and Clear Rivers
At an elevation of approximately 700 meters, Shima Onsen remains relatively cool during summer. The clear rivers and mountain landscape provide opportunities for fishing, river activities, hiking, and other outdoor experiences.
Yamame trout and iwana char can be found in the surrounding waterways, adding to the appeal of the region for nature lovers.
Autumn — Mountains of Red and Gold
Autumn foliage usually begins in early October, transforming the surrounding mountains into shades of red, orange, and gold.
The scenery is particularly beautiful when viewed from an outdoor hot spring bath, where visitors can enjoy the changing colors while surrounded by warm mineral-rich water.
Winter — A Quiet Snow-Covered Hot Spring Town
In winter, snow transforms Shima Onsen into a serene mountain retreat. Snow-covered rooftops, steaming baths, and white forests create a distinctly atmospheric scene.
A traditional yukimi-buro, or “snow-viewing bath,” offers a memorable way to experience the quiet beauty of winter in the Japanese mountains.
A Hot Spring Town with Centuries of History
Several legends surround the origin of Shima Onsen. Stories connect its discovery with historical figures such as Sakanoue no Tamuramaro and Usui Sadamitsu, while written references indicate that the hot spring was already known by the Kamakura period.
During the Sengoku period, the resort developed under the protection of the Sanada clan. During the Edo period, Shima became an established destination for toji, with visitors traveling here to spend extended periods bathing and resting.
From the Meiji period onward, improvements in transportation gradually transformed Shima from a traditional therapeutic retreat into a broader tourist destination. Its historic atmosphere, however, remains an important part of its appeal today.
Hinata-mi Yakushido — A Historic Temple in the Mountains
Hinata-mi Yakushido is a small historic Buddhist hall with a distinctive thatched roof. Designated as an Important Cultural Property of Japan, it was built in 1598 in the Zen architectural style.
The hall enshrines Yakushi Ruriko Nyorai, the Buddha of healing and medicine. Located in a quiet area toward the back of the hot spring town, it is surrounded by a peaceful atmosphere.
Visitors to Shima Onsen historically came here to pray for recovery from illness, and the temple continues to represent the close connection between hot spring bathing and religious traditions in the area.
Gomuso-no-Yu — The Legendary Birthplace of Shima Onsen
Located in the Hinata-mi district, Gomuso-no-Yu is traditionally regarded as the birthplace of Shima Onsen.
The bathhouse is associated with the area’s founding legends and remains open as a small public bath that can be enjoyed for a voluntary contribution.
Its simple traditional architecture and bath carved from black granite give the facility a quiet and almost sacred atmosphere. For visitors interested in the history of Japanese hot springs, it offers a direct connection with Shima’s past.
Shima Seiryū-no-Yu — A Riverside Day-Use Hot Spring
Located in the Yamaguchi district, Shima Seiryū-no-Yu is a convenient day-use facility where visitors can enjoy Shima’s hot spring waters.
The facility includes spacious indoor baths and outdoor baths. The open-air bath is especially popular because guests can hear the flowing Shima River while soaking in the warm water.
It is an easy option for travelers who want to experience a Shima Onsen bath during a day of sightseeing, as well as for overnight guests exploring the resort’s many bathing options.
Shima River Dam and Okushima Lake
Okushima Lake was created by the Shima River Dam and is one of the area’s most striking natural attractions.
The lake is famous for its remarkable blue-green water, often called “Shima Blue.” The unusual color changes depending on the season, weather, and light, creating an ever-changing landscape.
The lake is located beyond the Hinata-mi district and offers opportunities for walking, sightseeing, and canoeing. It is also a well-known autumn foliage destination.
Fresh greenery in spring, colorful foliage in autumn, and snow-covered scenery in winter give the lakeside a different character throughout the year.
Shima Lake — An Emerald-Green Mountain Lake
Shima Lake, located closer to the entrance of the hot spring resort, is another scenic attraction worth visiting.
Its beautiful emerald-green water makes it popular with photographers and nature lovers, while canoeing and other outdoor activities provide opportunities to experience the lake more actively.
Even a simple walk along the shore offers a chance to appreciate the rich natural environment surrounding Shima Onsen.
Maya Falls and Ogura Falls
The mountains around Shima Onsen are home to several waterfalls, including Maya Falls and Ogura Falls.
Walking through the forest to reach these waterfalls provides a refreshing change of pace from sightseeing in the town. The sound of rushing water, cool forest air, and lush vegetation create an ideal environment for a peaceful nature walk.
Ochiai-dori Shopping Street — A Taste of Old Japan
Ochiai-dori is a small shopping street extending from the area around Shinyu Yokochō Plaza. Its nostalgic Showa-era atmosphere makes it one of the most charming places to explore on foot.
Traditional craft shops, small restaurants, and old-fashioned entertainment establishments line the street, creating a scene reminiscent of a bygone Japan.
Visitors can enjoy local snacks, browse for souvenirs, and experience the friendly atmosphere of a traditional hot spring town.
Sekizenkan and Keiun Bridge — An Iconic Shima Onsen Scene
One of the most recognizable sights in Shima Onsen is Sekizenkan Honkan, a historic inn founded in 1691.
The main building is regarded as one of Japan’s oldest surviving wooden hot spring inn structures and is designated as an Important Cultural Property of Gunma Prefecture. Its traditional architecture provides a vivid impression of what an old Japanese hot spring resort looked like.
The inn stands beside Keiun Bridge, whose red railings create a striking contrast with the wooden building and surrounding mountains.
The area is especially popular for photography, and nighttime illumination gives the historic buildings an atmospheric appearance quite different from their daytime character.
Shima Tamura and Shima Yamaguchikan
Shima is also home to several long-established inns.
Shima Tamura traces its history to the Sengoku period, while Shima Yamaguchikan dates back to the Enpō era of the Edo period. These historic establishments have played an important role in the development of Shima Onsen and continue the tradition of welcoming travelers to the mountain resort.
Muse — Nakanojo Museum of History and Folklore
Located in Nakanojo Town, the Nakanojo Museum of History and Folklore “Muse” introduces the history, culture, and traditional way of life of the local area.
Exhibits help visitors understand the development of Shima Onsen and the lives of the people who have lived in the surrounding mountains. Combining a visit to the museum with sightseeing in Shima can provide a deeper understanding of the region’s cultural background.
Festivals and Cultural Events
Shima Onsen hosts local events throughout the year, adding seasonal energy to the otherwise peaceful hot spring town.
During the summer, the Shima Onsen Summer Festival features traditional bon odori dancing and fireworks, bringing residents and visitors together in the streets.
In autumn, events celebrating the colorful foliage and local products provide opportunities to sample regional specialties and experience local performing arts and traditions.
A Peaceful Mountain Escape in Gunma
Shima Onsen Town offers far more than hot spring bathing. Historic temples, traditional inns, public bathhouses, mountain lakes, waterfalls, forests, and nostalgic shopping streets are woven together throughout the valley.
Its greatest attraction is perhaps the balance between nature and culture. Visitors can spend the morning walking beside a clear mountain river, explore historic buildings in the afternoon, and finish the day relaxing in a traditional hot spring bath.
Whether visiting for a short excursion or staying several nights, Shima Onsen offers a chance to slow down and experience a quieter side of Japan.
Surrounded by mountains and blessed with abundant hot spring water, Shima Onsen remains a remarkable destination where centuries of bathing culture, local traditions, historic architecture, and beautiful nature come together.