Takaragawa Onsen Osenkaku is a renowned hot spring inn located in Minakami, Gunma Prefecture, in the upper reaches of the Tone River. Surrounded by untouched mountain scenery and set along the clear waters of the Takaragawa River, the secluded inn offers an authentic secret hot spring experience in the heart of nature.
Founded in 1923, Osenkaku has a long history as a traditional hot spring retreat. Today, it is particularly famous for its spectacular open-air baths and abundant natural hot spring water, attracting visitors not only from across Japan but also from around the world.
Takaragawa Onsen has attracted attention from international travel guides and media as well as Japanese travelers. Lonely Planet, one of the world’s leading travel guide publishers, selected Takaragawa Onsen as No. 1 among its top 10 hot springs in Japan and introduced it as a Best Riverside Onsen.
It has also been featured by international news agency Reuters among its “10 Great Hot Springs of the World,” further contributing to its international reputation.
These accolades have helped make Takaragawa Onsen a destination especially appealing to travelers from overseas who want to experience Japan’s traditional hot spring culture in a spectacular natural setting.
The greatest attraction of Osenkaku is its enormous collection of open-air baths, covering a combined area equivalent to approximately 470 tatami mats.
Four open-air baths are located along the Takaragawa River. Surrounded by huge natural rocks and forest, the baths blend into the landscape and provide an extraordinary feeling of openness.
The baths consist of the mixed-gender Maka-no-Yu, Hannya-no-Yu, and Kodakara-no-Yu, along with the women-only Maya-no-Yu. Each has its own atmosphere and character.
Among them, the iconic Maka-no-Yu covers approximately 120 tatami mats and has appeared in numerous magazines and visual productions, making it one of the best-known hot spring baths in the region.
Maka-no-Yu was constructed in 1940 and is regarded as one of the symbols of Takaragawa Onsen.
Located directly beside the flowing river, the bath allows guests to soak in the hot spring while listening to the sound of the water just a few steps away. The surrounding scenery changes dramatically with the seasons, with autumn foliage and winter snow creating particularly spectacular views.
Covering approximately 200 tatami mats, Kodakara-no-Yu is the largest of the open-air baths and offers an exceptional sense of space.
A small shrine is enshrined above the bath, giving the area a distinctive and somewhat mystical atmosphere. The bath is also associated with a local tradition that bathing here brings the blessing of children, and it has long attracted visitors for this reason.
Hannya-no-Yu has a quieter atmosphere and covers approximately 50 tatami mats.
Part of the bath is relatively shallow, making it easier for children to enjoy with their families. The lighting is kept subdued at night, creating a peaceful atmosphere for guests who prefer a more tranquil bathing experience.
Maya-no-Yu is a women-only open-air bath covering approximately 100 tatami mats.
It combines a spacious, open design with a traditional solid hinoki cypress changing area, providing a comfortable environment in which women can enjoy the hot spring surrounded by nature.
Takaragawa Onsen is supplied by four natural hot spring sources on the property, producing approximately 1,800 liters of water per minute.
This abundant flow allows the open-air baths to be filled with fresh hot spring water directly from the source, without recirculation.
The water is classified as a weakly alkaline simple hot spring. It is clear and gentle, and the mineral-rich water has traditionally been enjoyed for bathing and relaxation, including relief from everyday fatigue, muscle discomfort, and sensitivity to cold.
Guests using the mixed-gender open-air baths wear specially provided yuyami clothing, or bathing garments, designed for use in the baths.
This system makes the experience more comfortable for first-time visitors and international travelers who may be unfamiliar with mixed-gender bathing in Japan. Guests are required to use the bathing garments provided by the facility rather than bringing their own.
One of the greatest attractions of Takaragawa Onsen is the way the surrounding valley changes with the seasons.
In spring, mountain cherry blossoms add delicate color to the landscape. Early summer brings brilliant fresh greenery, while autumn transforms the valley into a spectacular display of red, orange, and golden foliage.
In winter, the entire area becomes covered in snow, creating the magical experience of a snow-viewing open-air bath.
Soaking in the warm water while surrounded by the silence of a snowy mountain landscape is particularly memorable. Steam rising from the baths against the white scenery creates an almost dreamlike atmosphere.
Takaragawa Onsen was also featured as a filming location for the 2014 movie Thermae Romae II, a popular Japanese film inspired by the world of Roman baths and Japanese hot springs.
The enormous Kodakara-no-Yu was used for an especially memorable bathing scene. The combination of the open-air bath, flowing river, and enormous rocks introduced the dramatic beauty of Takaragawa Onsen to audiences both in Japan and overseas.
The atmosphere is especially enchanting in the early morning, when mist may linger over the river, and around sunset, when soft light filters through the surrounding landscape. Winter, with its snow-covered scenery, can look almost like a traditional Japanese painting.
International interest has continued to grow, and visitors from approximately 150 countries have traveled here, making Takaragawa Onsen a truly international hot spring destination.
Osenkaku’s accommodation consists of three buildings: the Main Building, East Building, and First Annex, each offering a different atmosphere.
The Main Building is a traditional wooden structure featuring hinoki-leaved cypress construction and warm architectural details incorporating cherry wood for its pillars. The First Annex was built in 1936 and retains the nostalgic atmosphere of an older Japanese inn.
All guest rooms feature traditional Japanese-style tatami flooring. From the adjoining sitting areas, guests can enjoy views of the Takaragawa River and the changing scenery of the seasons.
Spending a quiet night in such surroundings offers a chance to step away from the routines of everyday life and fully immerse yourself in the peaceful mountain environment.
Meals at Osenkaku focus on traditional mountain cuisine, making full use of the inn’s location surrounded by mountains.
Seasonal ingredients include wild mountain vegetables in spring, mushrooms in autumn, and freshwater fish from the clear local streams. These ingredients are prepared in ways that highlight their natural flavors.
Meals may include dishes cooked over a charcoal fire as well as traditional kaiseki-style cuisine, with menus changing according to the season.
At Take-niwa, a dining area designed with private-room-style spaces, guests can enjoy their meals in a calm and comfortable atmosphere.
Takaragawa Onsen is associated with a Japanese legend that says Prince Yamato Takeru discovered the hot spring after being guided to it by a white hawk.
Because of this legend, the spring was once known as “Hakutaka-no-Yu,” or “White Hawk Hot Spring.” The waters have been providing people with a place to rest and recuperate for generations, and the story remains an important part of the area’s heritage.
The hot spring was developed as a therapeutic bathing retreat during the Taisho period. Later, road improvements associated with dam construction during the Showa period made the area easier to access and contributed to the development of the resort in its present form.
Visitors do not necessarily need to stay overnight to experience Takaragawa Onsen. The property also includes Takaragawa Sanso, which offers day-use bathing.
After completing the reception process, visitors can follow the path toward the river and explore the various open-air baths. The facility also includes a resting room, restaurant, and shop.
Visitors can enjoy dishes such as kamameshi, a traditional rice dish cooked in an individual pot, along with other mountain specialties. It is an easy way to experience the distinctive atmosphere of Takaragawa Onsen even on a day trip.
Takaragawa Onsen Osenkaku brings together hot springs, spectacular nature, history, and traditional Japanese culture in one remarkable destination.
Soaking in the warm waters while listening to the gentle sound of the Takaragawa River creates a deeply relaxing experience, while the surrounding landscape provides a constantly changing backdrop throughout the year.
For travelers seeking to escape the bustle of everyday life and experience a hot spring surrounded by wilderness, Takaragawa Onsen offers an unforgettable opportunity to relax in harmony with nature.