Shima Onsen’s First Private Cottage with an Open-Air Onsen Bath

Set beside the scenic Shima River Gorge, with views of Fusen-kyo Gorge—also known for its brilliant autumn foliage—ShimaBlue is a secluded retreat in the mountains. With the soothing sounds of the Shima River nearby, this is Shima Onsen’s first private cottage property featuring open-air Onsen baths, offering seven distinctive spaces to relax and enjoy the renowned waters of Shima Onsen. The seven guest cottages each feature their own uniquely designed private open-air Onsen bath. Lined up along the river, they offer an airy terrace where the gentle murmur of flowing water creates a calming atmosphere. Dining includes our signature barbecue showcasing carefully selected ingredients from Gunma Prefecture, along with a wide selection of local craft beer, wine, and more. Surrounded by the beautiful nature of the Shima River—beloved as “Shima Blue”—enjoy an unforgettable villa-style stay filled with scenery, cuisine, and local blessings.

  • The spacious hinoki bathtub in the onsen was amazing, with plenty of room to stretch out. As advertised, the BBQ hamburger at dinner was the most delicious. We stayed in a room called "Island Blue," and the wood stove provided a warm and relaxing atmosphere. The autumn leaves from the room and the view of Hosen Gorge within the property were stunning. This time, we used our trial Diamond membership, so late check-out went smoothly; however, it was slightly disappointing that we had to confirm during dinner to receive the Chivas Regal benefit. It seems improvements have been made compared to reviews from a few years ago, so there’s still potential for further growth.

    BotW 11/19/2025
  • It was my first glamping experience, and I chose Shima Blue among various glamping facilities. Recently, some rooms have been renovated. Previous reviews mentioned issues such as complete darkness during nighttime bathing and inconvenient toilet access, but I could feel that Shima Blue had worked to address these problems. The bath area was well-lit at night, and the river was illuminated too, making it a fantastic experience to bathe while enjoying nature. The room layout also didn’t bother me much, allowing for a comfortable stay. However, one thing I noticed was that there was only one bath mat when going from the shower to the open-air bath, which made the floor wet. During check-in, it was sleeting outside and I wanted to use the café shared with the facility; however, possibly due to limited staff availability, I couldn’t use it at that time. Overall though, the meat, vegetables, and bouillabaisse soup were delicious and very satisfying! I’d love to visit again in a different season.

    リゾート素敵 3/31/2025

Facilities and Services

See All
  • Hot spring
  • Room with Open-Air Bath
Free-flowing hot spring / Sauna / Free shuttle service / Room service
IN15:00~17:00
OUT10:00
Number of rooms7 rooms
PetNot allowed
Your childPermitted

Notice from the Accommodation

■Regarding children of elementary school age and younger
Please note that there are areas on the terrace and within the property where the gaps between railings are wide.
Children must be supervised by a parent or guardian at all times.

[Room with Open-Air Bath] Maple White
  • Vacation rental
  • 27㎡
  • Capacity 1~2 people

[No Meals Included] No Meals Included Plan

IN 15:00~19:00
OUT 10:00
¥44,000
No meals ; 2 peopleTax included¥40,920
(USD 256.48)

[One Night Stay with Two Meals] BBQ Course

IN 15:00~17:00
OUT 10:00
¥59,400
Dinner and Breakfast included ; 2 peopleTax included¥55,242
(USD 346.25)
【Room with Open-Air Bath】Little Garden
  • Vacation rental
  • 42㎡
  • Capacity 1~4 people

[No Meals Included] No Meals Included Plan

IN 15:00~19:00
OUT 10:00
¥46,200
No meals ; 2 peopleTax included¥42,966
(USD 269.31)

[No Dinner] One Night with Breakfast Plan

IN 15:00~19:00
OUT 10:00
¥50,600
Breakfast included ; 2 peopleTax included¥47,058
(USD 294.95)
【Room with Open-Air Bath】Safari Black
  • Vacation rental
  • 42㎡
  • Capacity 1~4 people

[No Meals Included] No Meals Included Plan

IN 15:00~19:00
OUT 10:00
¥46,200
No meals ; 2 peopleTax included¥42,966
(USD 269.31)

[One Night Stay with Two Meals] BBQ Course

IN 15:00~17:00
OUT 10:00
¥61,600
Dinner and Breakfast included ; 2 peopleTax included¥57,288
(USD 359.08)

Best-Selling Stays

Stays Popular For Natural Hot Springs

Rooms With Open-Air Baths Popular At Stays

Accommodation With Low Beds Or Futons, Safe For Sleeping Children

Introduction of the Accommodation

Exterior of Onsen Glamping Shimablue
Shima Blue Onsen Glamping Exterior
Shima Blue Onsen Glamping Exterior
Shima Blue Onsen Glamping Exterior
Exterior of Onsen Glamping Shimablue
Shima Blue Onsen Glamping Exterior

Shima Blue Onsen Glamping Exterior

Shima Onsen’s first private cottage with an open-air Onsen bath

~A Forest Villa Stay by the Babbling Stream~ Set along the scenic Shima River gorge. Nestled in the mountains overlooking Fusen-kyo Gorge, also known for its autumn foliage, “ShimaBlue” offers seven distinctive private cottages—each with its own open-air Onsen bath—where you can savor the renowned waters of Shima Onsen to the soothing sound of the stream. Blending the luxury of a secluded retreat with the ease of outdoor living, it’s neither a Hotel nor a campsite—it’s truly your own private forest residence. In this lush sanctuary welcomed by the beautiful nature of the Shima River, beloved as “Shima Blue,” enjoy breathtaking views, local cuisine, and a longed-for villa getaway enriched by regional blessings.

[Guest Room with Open-Air Bath] Honey Natural
[Room with Private Open-Air Bath] Safari Black
[Room with Private Open-Air Bath] Safari Black
[Guest Room with Open-Air Bath] Island Blue
[Guest Room with Open-Air Bath] Island Blue
[Room with Private Open-Air Bath] Honey Natural
[Guest Room with Open-Air Bath] Honey Natural
[Room with Private Open-Air Bath] Safari Black

[Room with Private Open-Air Bath] Safari Black

Guest rooms, each featuring a private open-air bath with 100% free-flowing natural hot spring water.

There are seven cottages, each featuring a private open-air Onsen bath with free-flowing natural hot spring water. Styled around different themes, each cottage offers an airy BBQ terrace and outdoor living space, with distinctive exteriors, interiors, furnishings, and layouts to make every stay a new travel experience.

Meals
Selectable Dining Options, Locally Sourced Ingredients

For dinner, you can choose from a variety of Plans to suit your preferences. Enjoy an Akagi beef sukiyaki Plan and relax in your Room, a BBQ Plan surrounded by nature, or a no-dinner Plan where you bring your own ingredients—choose the style that suits you best.

Jupiter’s Kitchen
Enjoy premium burgers at [Front & Cafe] Jupiter’s Kitchen

At Jupiter’s Kitchen, the Front & Cafe located near the entrance of the property, you can enjoy drinks and premium burgers. Relax at the open-atrium table seating filled with bright sunlight, take in the nature spread out before you, and savor a leisurely “Shima Blue” moment as time gently passes.

Private Sauna for Exclusive Use [Forest Sauna]
Private Sauna for Exclusive Use [Forest Sauna]

On the property, you’ll find the “Forest Sauna,” a private, authentic löyly sauna overlooking Kaede-senkyō Gorge, one of the scenic highlights of Shima Valley. Enjoy it with someone special, with family, or with friends—there are many ways to spend your time in Shima Blue.

Shima’s Great Outdoors
A wide variety of activities to enjoy in the great outdoors of Shima Onsen

The Shima River is a crystal-clear blue stream, also known as “Shima Blue.” At Shima Blue, we offer a variety of seasonal experiences that let you enjoy the area’s abundant water resources, including river trekking and clear-stream walks that parents and children can join together.

Facilities and Equipment of Accommodation

  • The room
    The room
  • Hot Springs & Baths
    Hot Springs & Baths
  • Surroundings & Others
    Surroundings & Others
  • Meal
    Meal

Basic Information

Card information
VISA / MASTER / JCB / AMEX / DINERS / UnionPay
Pets
Not allowed
BreakfastYou can choose between breakfast at the café or breakfast in your Room at check-in.
Your child
You can stay.
■Regarding children of elementary school age and younger Please note that there are areas on the terrace and within the property where the gaps between railings are wide. Children must be supervised by a parent or guardian at all times.
Room service
Available for use
7:00 PM (Last order for additional ingredients) 7:30 PM (Last order for drinks)
Common amenities
  • ○ Shampoo · conditioner
  • ○ Body soap · soap
  • ○ Towel · Bath towel
  • ○ Face towel
  • ○ Bath towel
  • × Body towel · sponge
  • ○ Toothbrush set
  • ○ Comb · Brush
  • × Shower cap
  • ○ Hair dryer
  • ○ Shaving
  • × Shaving Gel/Foam
  • × Bath additives
  • × Yukata
  • × Nightwear
  • ○ Bathrobe
  • ○ Slippers
  • ○ facial cleanser
  • ○ Toner
  • ○ Lotion
  • ○ Makeup remover
  • ○ Cotton swab
  • ○ Cotton
  • ○ Clothing deodorizing spray
  • × Refrigerator
  • × Minibar
  • ○ Electric kettle
  • ○ Tea set (free)
  • × Television
  • ○ Safe
  • × Scale
  • × Trouser press
  • × Free morning edition
  • × Pay-per-view broadcast
  • × Satellite broadcasting
  • × Video on Demand
  • × Radio
  • × CD player
  • × DVD player
  • × Blu-ray player
  • ○ Speakers for portable audio
  • × In-room PCs and tablets
  • × Microwave oven
  • × Tableware
  • × Washing machine
  • × Dryer
Facilities and Features
  • ○ Entire building rental
  • × With kitchen
  • ○ Housekeeping service available for consecutive nights
  • × With a washing machine.
  • × Multiple bedrooms
  • × Supermarket nearby
  • × Within walking distance of the station
  • ○ Parking available
  • ○ Meal service available
  • × Catering
  • × Outside food allowed
  • ○ Hot spring available
  • × Swimming pool available
  • × Barrier-free
  • × Pet-friendly
Esthetic Massage
None
Fitness gym
None
Room with Open-Air Bath
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
(Heating)
Remarks
Spring quality and benefits

Sulfate Spring

Fatigue recovery, sensitivity to cold, neuralgia, etc.

SaunaAvailable
Hot stone spaNone

Reviews

Overall Score
3.60
(15)
  • Rooms & Amenities
    3.67
  • Facility
    3.33
  • Hospitality & Service
    3.40
  • Meals
    3.50
  • Onsen & Bath
    4.07
  • Satisfaction
    3.60

*Reviews that have been translated from Japanese.*

*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*

Access Information

Address
Gunma Prefecture4355-9 Shima, Nakanojo-machi, Agatsuma-gun
TEL:+81-279-64-2155

[By Car] About 1 hour via Route 353 from the Kan-Etsu Expressway “Shibukawa-Ikaho IC”.

[By Train] About 2 hours from Ueno Station to Nakanojo Station on the JR Limited Express Kusatsu, then about 40 minutes by bus bound for Agatsuma Onsen. Get off at the last stop, then about 5 minutes by Shuttle Service. (About 15 minutes on foot.)

[By Bus] About 3 hours and 30 minutes by direct bus from Tokyo Station (Yaesu South Exit).
From Shima Onsen (final stop), about 5 minutes by Shuttle Service. (About 15 minutes on foot.)
*If you would like to take the direct bus, please apply via Kan-Etsu Kotsu Co., Ltd.’s bus Reservation website or by phone.
*Shuttle Service from the bus stop to the Facility is available by advance Reservation only.

Parking Information
Fee
Free for guests
Parking time
---
Parking space
No restrictions
Number of parking spaces
12 cars available outdoor
Valet service
Unavailable
The parking area, guest rooms, and reception are all located on the same property and within walking distance.

Pickup and drop-off information
Available (Free)Advance Reservation is required. Please choose from 14:40, 15:10, or 15:50. The earliest available time is 14:40.
If you would like to request this, please be sure to contact us by email.
Guests using Plan benefits or requesting the paid 14:00 check-in may also choose 13:45.

Frequently Asked Questions

Search by Theme

Find by tourist destination