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Kanouya Shima Onsen
Gunma Prefecture/Agatsuma DistrictAn auberge Hotel featuring river views, with private open-air baths in every room supplied by free-flowing natural hot spring water.
Opened in November 2024, "Kanouya Shima Onsen" offers all rooms with private open-air Onsen baths featuring natural hot spring water. Situated along the clear Shimagawa River, you can enjoy breathtaking views of Shima's nature through large windows and from the baths. Escape the hustle and bustle of the city and indulge in a relaxing time immersed in nature.
I was able to relax from arrival to departure!The open-air Onsen bath was amazing, and both dinner and breakfast were delicious—making for a truly happy stay.The river flowing past the lobby and visible from the Room, along with the lush green trees, was incredibly beautiful, letting you fully enjoy summer in the mountains.One drawback is that because it is built along the riverbank, getting up and down can be difficult. There is no elevator, so all movement is by stairs. In particular, the stairs down to the first floor are quite narrow and steep (though you likely won’t need to move around inside the Hotel very often).Also, precisely because the Onsen is so wonderful, you’ll want to soak many times—but despite that, the bath towels were thin and there were no bathrobes. Very disappointing! With such a great Onsen, I wish they would make it easier to fully enjoy it!That said, overall it was a fantastic experience, and I would definitely like to visit again.
かりかりんとう7 9/7/2026The first floor features a wonderful, very spacious Room with high ceilings. In particular, the Room includes an open-air bath where you can bathe standing up, and I was very satisfied because I could soak many times and even exercise in the bath. The food was also excellent—the steak was tender, high-quality Joshu beef. The international staff spoke polite Japanese very well.
のいたか 9/14/2026
Facilities and Services
See All- Hot spring
- Room with Open-Air Bath
- Spa facility
| IN | 15:00~20:00 |
|---|---|
| OUT | 10:00 |
| Number of rooms | 8 rooms |
| Pet | Not allowed |
| Your child | Permitted |
Photo
See AllIntroduction of the Accommodation






Kanouya Shima Onsen Exterior
Opened in November 2024, "Kanouya Shima Onsen" is nestled along the Shimagawa River. The building, featuring a simple and stylish Nordic design that harmonizes with the surrounding nature, offers eight luxurious rooms, each equipped with a private open-air Onsen bath fed by natural hot springs. Guests can enjoy the beauty of Shima's changing seasons through large windows and from their baths. Escape the hustle and bustle of city life and indulge in serene moments accompanied by the gentle lullaby of flowing water.





Restaurant "J’s CANYON"
The facility features "J’s CANYON," a steakhouse supervised by Chef Sato, who achieved 3rd place nationwide at the food sports event "JAPAN Burger Championship 2024" (JBC). The menu offers an authentic steak dinner made with Joshu beef sirloin. The L-bone sirloin steak, known for its rich flavor from collagen seeping out of the bone, is a popular cut. Expert chefs who understand the ingredients perfectly ensure precise cooking to bring out the best taste of the meat.

Each Room features a unique layout and ambiance, all offering scenic views. Equipped with open-air hot spring baths fed directly from the source, the design embraces a Nordic lifestyle that values time spent in harmony with nature. Large picture windows frame the stunning beauty of the Shima River like a painting, seamlessly blending it into your stay.

At the private esthetic salon Sowaka located within our facility, we offer treatments for radiant skin and mental rejuvenation. Our menu includes a variety of services such as body care, facials, and reflexology. Enjoy your exclusive time in a refined space with carefully selected high-quality products.
Group Facility List

Shima Onsen - Tsuruya, Kanemiduki no Yu
Located in the highest area of Shima Onsen within the Joshinetsu National Park, "Shima Onsen Kanosakinosato Tsuruya" offers a luxurious bathing experience with a blend of four hot spring sources from Shima Onsen. Enjoy the pristine air, chirping birds, and rich natural surroundings while indulging in high-quality onsen water (all rooms feature private onsen baths with free-flowing spring water), and spend a rejuvenating time for both body and mind.

Onsen Glamping Shima Blue
"Onsen Glamping Shima Blue" combines the charm of Shima Onsen with outdoor adventure, offering glamping accommodations with private onsen open-air baths. The seven detached guest rooms, each featuring a private onsen open-air bath, are situated along the scenic Kaede-sen Gorge by the flowing Shima River. From the spacious terraces, you can enjoy the soothing sounds of the river. Meals include a signature barbecue featuring carefully selected ingredients from Gunma Prefecture, complemented by a variety of local craft beers and wines. Immerse yourself in the rich nature of Shima and spend your time at your own pace in this serene retreat.
Facilities and Equipment of Accommodation
- The room
- Restaurant
- Facilities & Services
Basic Information
| Taxes | Hot Spring Tax: JPY 150 per person Please pay on-site. |
|---|---|
| Card information | VISA / MASTER / JCB / AMEX |
| Pets | Not allowed |
| Breakfast | Japanese-style breakfast: JPY 2,200 per person Supervised by the Executive Chef of our sister property, Tsuruya Ryokan |
| Your child | You can stay. For children of elementary school age or younger, Child Sharing Existing Bedding is JPY 5,500; if extra bedding is required, the same rate as an adult applies. |
| Room service | Available for use From 5:30 PM to 8:30 PM
Drinks only (set courses are not available)
*Please note that we may not be able to accommodate this during peak periods such as the New Year holidays.* |
| Common amenities |
|
| Facilities and Features |
|
| Esthetic Massage | Available Opened in March 2025: “Esthetic Salon Sowaka”
The only esthetic salon in Shima. Massage services are also available.
We help relieve everyday fatigue such as eye strain and stiff shoulders. |
| Fitness gym | None |
| Room with Open-Air Bath |
|
| Spring quality and benefits | Calcium and sodium sulfate Onsen Helps relieve fatigue, promotes healthy skin, and may ease gastrointestinal issues, neuralgia, skin conditions, minor abrasions and cuts, and atopic dermatitis. ※Regarding the notation of "Gensen Kakenagashi" |
| Sauna | None |
| Hot stone spa | None |
| Others | [Check-in for Dinner-Included Plans] - Check-in is normally available until 5:00 PM. - If you will be checking in after 5:00 PM (late check-in), please contact the Facility in advance. |
Reviews
- Rooms & Amenities4.26
- Facility3.89
- Hospitality & Service4.04
- Meals4.27
- Onsen & Bath4.55
- Satisfaction4.21
*Reviews that have been translated from Japanese.*
*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*
Access Information
Gunma Prefecture4139-12 Shima, Nakanojo-machi, Agatsuma-gun
TEL:+81-279-26-7510
JR Agatsuma Line: 40 min by bus from Nakanojo Station to Shima Onsen → get off at the last stop, then a 15 min walk (Shuttle Service to the last bus stop available; Reservation required).
- Parking Information
- Fee
- Free for guests
- Parking time
- Open 24 hours
- Parking space
- No restrictions
- Number of parking spaces
- 10 cars available outdoor
- Valet service
- Unavailable
- Pickup and drop-off information
- Available (Free)We offer a free Shuttle Service from the last bus stop in Shima Onsen to our property.
This service runs in three time slots. Please contact us at least 3 days in advance.
14:40/15:10/15:50
Frequently Asked Questions
What are the check-in and check-out times?
Check-in 15:00~20:00 Check-out 10:00
What kind of facilities and features are available?
There are the following facilities and features. Hot spring・Rooms with open-air baths available・Free-flowing hot spring・Spa facility・Free shuttle service・Room service
I would like to know the access information.
JR Agatsuma Line: 40 min by bus from Nakanojo Station to Shima Onsen → get off at the last stop, then a 15 min walk (Shuttle Service to the last bus stop available; Reservation required).
Is parking available?
・Fee: Free for guests ・Parking Hours: Open 24 hours ・Parking space: Length --- Vehicle width --- Vehicle height --- ・Number of parking spaces: 10 cars ・Valet Service: Unavailable Four parking spaces are available free of charge in front of the property, and you may also use the free “Yuzuriha” parking lot about a 1-minute walk away.
Do you have esthetic massages?
Yes, there is. Opened in March 2025: “Esthetic Salon Sowaka” The only esthetic salon in Shima. Massage services are also available. We help relieve everyday fatigue such as eye strain and stiff shoulders.
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