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- Gensen Kakenagashi Hot Spring Theme Park Ryudo
Gensen Kakenagashi Hot Spring Theme Park Ryudo
Gunma Prefecture/Yunogoya OnsenEnjoy 18 types of private open-air hot spring baths with 100% free-flowing natural spring water.
[Gunma • Minakami Onsen] A secluded hot-spring Accommodation nestled in the mountains at an elevation of 800 m. Enjoy 18 distinct private open-air baths, all fed directly from the source, no Reservation required, and free to use throughout your stay. Fresh greenery in spring, deep summer greens with fireflies, vivid autumn foliage, and serene winter snowscapes. After touring the baths while taking in breathtaking seasonal views, savor seasonal mountain cuisine in a private dining room. In a truly private setting, couples, spouses, and families with children can relax and enjoy their time without concern.
If you love Onsen, this place is truly heaven—there are 18 private baths.This was my third stay, and I still haven’t managed to try them all.The detached cottage “Aoi” has its own open-air bath, which is absolutely wonderful. I always end up completely satisfied just using the bath in the Room.The spring quality is a simple Onsen (slightly alkaline, hypotonic, high-temperature) with a pH of 8.3.It feels gentle on the skin and is easy to enjoy in a different way from more distinctive springs like sulfur Onsen. It’s comfortable for longer soaks, and being able to enjoy it many times during your stay is part of the appeal.Many of the open-air baths have a rustic, DIY-like feel.Numerous private baths are scattered across the vast grounds, and I can only imagine how much work it must be to maintain and manage so many.Because this Accommodation is surrounded by nature, things like insects and fallen leaves are somewhat unavoidable.In July there were quite a few insects, and when I visited last September I also had trouble with biting gnats.Even so, this Accommodation has more than enough charm to make up for it.The source spring has an abundant flow rate, and the source temperature is very high at 76.1°C.To bring it down to a comfortable temperature, adding water may sometimes be necessary.As an Onsen lover, I’d ideally like to enjoy pure free-flowing water without dilution—but with such a high-temperature source spring, I understand that temperature control can be challenging.Many of the staff are from overseas, but everyone speaks Japanese well and I’ve never felt inconvenienced. They are always polite and attentive.And despite being such a secluded hot-spring retreat, it’s great that the meals are genuinely delicious as well.This time we ordered sukiyaki as an extra dish; it was excellent and very satisfying.In winter this area apparently gets extremely heavy snowfall.Next time I’d love to visit in winter and enjoy an outdoor bath while admiring snowy scenery.
Arcticarcher 8/18/2026There are many cats on the property, and some of them will let you pet them, which is incredibly soothing. On the other hand, if you’re not comfortable around cats, it might be a bit tough. At night, when I went to the “Star” bath, a kitty had snuck in and was curled up in a changing basket (lol).Many of the staff are from overseas, but everyone’s attentiveness was truly outstanding—from guiding us to our Room to serving meals—so I never felt uneasy during my stay.Most importantly, the Onsen was fantastic: we were able to reserve several large baths for private use, and it was a lot of fun.If there’s one thing to note, since it’s surrounded by nature, you may see some insects. I was also worried about mobile reception, but Rakuten Mobile and au worked without any issues.I’d love to visit again when the weather is cooler.
R141 7/28/2026
Facilities and Services
See All- Hot spring
- Room with Open-Air Bath
| IN | 15:00~18:00 |
|---|---|
| OUT | 11:00 |
| Number of rooms | 22 rooms |
| Pet | Not allowed |
| Your child | Permitted |
Photo
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Introduction of the Accommodation

Ryudo is a secluded retreat nestled in the mountains of Minakami, Gunma, at an elevation of 800 meters. Surrounded by nature, guests can enjoy an Onsen tour of 18 rustic open-air baths. Thanks to our abundant hot spring water, every open-air bath on the property is supplied with 100% natural hot spring water directly from the source (free-flowing), and all baths are available free of charge for private use 24 hours a day with no time limit. We also offer day-use Onsen access that includes all private open-air baths, ideal for those short on time. Located about three hours from Tokyo Station, it’s perfect for a day-trip drive from the greater Kanto area. Come and experience this hidden gem in Minakami, Gunma—open-air baths in the heart of nature. We look forward to welcoming you.

Tour 18 hidden hot springs—all open-air baths are available for private use.
All open-air baths are available free of charge for private use 24 hours a day, with no time limit—so you can relax and enjoy hot spring hopping to your heart’s content without worrying about anything else. With as many as 18 unique open-air baths, you can fully indulge in a true hidden hot spring experience. Options include riverside open-air baths where you can soak while gazing at the stream up close, as well as large open-air baths that can accommodate more than 20 guests at once. At night, unwind while looking up at the moon and stars; in the morning, soak to the sound of birdsong and breathe in the crisp mountain air. The scenery and atmosphere change depending on the time of day. Enjoy the luxury of bathing whenever you like, for as long as you like, without concern for others. Savor your own perfect hidden hot spring journey to your heart’s content.

A stamp station is available at each open-air bath. Guests who collect stamps from all 18 locations will receive a commemorative gift. Please give it a try.

Surrounded by mountains and a river, our property welcomes you with a total of 22 Rooms in a natural setting. In our riverside Rooms, relax as you listen to the gentle flow of the river through your window. In our mountain-side Rooms, enjoy the ever-changing scenery of nature throughout all four seasons. From time to time, you may even spot Japanese serow (a designated Natural Monument) or wild monkeys—an experience unique to staying in the mountains.

Deep in Minakami, in Okutone, you’ll find an abundance of natural blessings from the mountains and rivers, including seasonal fresh vegetables harvested from the mountains that very day. We carefully select the finest ingredients from the mountains and rivers throughout all four seasons, present them to suit each season, and deliver exceptional dishes with meticulous attention to safety. Our salt-grilled char is especially popular. Please relax and enjoy your meal at your own private dining room.
Facilities and Equipment of Accommodation
- The room
- Hot Springs & Baths
- Facilities & Services
- Meal
Basic Information
| Taxes | A Hot Spring Tax of JPY 150 per adult will be charged separately. |
|---|---|
| Card information | VISA / MASTER / JCB / AMEX / DINERS / Debit card |
| Pets | Not allowed |
| Breakfast | There is no information about breakfast. |
| Your child | You can stay. |
| Room service | Available for use Beverage service is available until 22:00. |
| Common amenities |
|
| Facilities and Features |
|
| Esthetic Massage | None |
| Fitness gym | None |
| Open-air bath |
|
| Private bath |
|
| Room with Open-Air Bath |
|
| Spring quality and benefits | Mildly alkaline simple hot spring Fatigue recovery, gastrointestinal issues, neuralgia, sensitivity to cold, and skin-beautifying benefits ※Regarding the notation of "Gensen Kakenagashi" |
| Sauna | Available |
| Hot stone spa | None |
| About Hygiene Measures | Thank you very much for your continued patronage.
To help prevent the spread of COVID-19, we have implemented the following measures and kindly ask for our guests’ cooperation.
【At Check-in】
・Alcohol hand sanitizing at the front desk
・Temperature checks for all guests
・Alcohol sanitizing by staff before each guest interaction
【Inside the Property】
・Alcohol sanitizer available at the entrance and dining area
・Ventilation in areas where crowding may occur
【After Check-in】
・Unless necessary, we will not visit your Room and will provide guidance via internal phone calls
・Futon bedding service has been suspended and changed to self-service
【Dining Area】
・Alcohol hand sanitizing before entering private dining rooms
・Reduced frequency of meal service to minimize contact opportunities
・Thorough disinfection of kitchens, tableware, and related items
【At Check-out】
・Alcohol sanitizing after each guest interaction (including disinfection of Room keys)
・Cashless payment is recommended
【Room Cleaning】
・Thorough ventilation
・Final wipe-down with a sodium hypochlorite solution
【Staff Health Management】
・Thorough handwashing and gargling
・Health checks and condition management (including temperature checks before coming to work)
・Mandatory mask-wearing while serving guests
*We will continue to make improvements to further enhance the safety and peace of mind of both our guests and staff.* |
Reviews
- Rooms & Amenities3.76
- Facility3.91
- Hospitality & Service4.30
- Meals4.27
- Onsen & Bath4.70
- Satisfaction4.36
*Reviews that have been translated from Japanese.*
*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*
Access Information
Gunma Prefecture6192 Fujiwara, Minakami-machi, Tone-gun
TEL:+81-278-75-2086
JR: Take the bus bound for Yunokoya Onsen from Minakami Station (40 minutes). Get off at the last stop (Yunokoya) and walk 2 minutes.
- Parking Information
- Fee
- Free for guests
- Parking time
- ---
- Parking space
- No restrictions
- Number of parking spaces
- 26 cars available Indoor & Outdoor
- Valet service
- Unavailable
- Pickup and drop-off information
- Unavailable
Frequently Asked Questions
Please provide information about Open-air bath.
・Business Hours: 00:00~00:00 ・Hot spring: Available ・Free-flowing: Available ・Cloudy hot spring water: None ・Supplementary information: 100% natural hot spring 18 types of open-air baths and four indoor baths are available 24 hours a day.
What kind of facilities and features are available?
There are the following facilities and features. Hot spring・Rooms with open-air baths available・Open-air bath・Free-flowing hot spring・Private bath・Sauna・Room service
I would like to know the access information.
JR: Take the bus bound for Yunokoya Onsen from Minakami Station (40 minutes). Get off at the last stop (Yunokoya) and walk 2 minutes.
Is parking available?
・Fee: Free for guests ・Parking space: Length --- Vehicle width --- Vehicle height --- ・Number of parking spaces: 26 cars ・Valet Service: Unavailable
Please provide information about Private bath.
・Business Hours: 00:00~00:00 ・Hot spring: None ・Free-flowing: Available ・Cloudy hot spring water: None ・Supplementary information: 100% natural hot spring
Is there a sauna?
Yes, there is.
What kind of hygiene management is being conducted?
Thank you very much for your continued patronage. To help prevent the spread of COVID-19, we have implemented the following measures and kindly ask for our guests’ cooperation. 【At Check-in】 ・Alcohol hand sanitizing at the front desk ・Temperature checks for all guests ・Alcohol sanitizing by staff before each guest interaction 【Inside the Property】 ・Alcohol sanitizer available at the entrance and dining area ・Ventilation in areas where crowding may occur 【After Check-in】 ・Unless necessary, we will not visit your Room and will provide guidance via internal phone calls ・Futon bedding service has been suspended and changed to self-service 【Dining Area】 ・Alcohol hand sanitizing before entering private dining rooms ・Reduced frequency of meal service to minimize contact opportunities ・Thorough disinfection of kitchens, tableware, and related items 【At Check-out】 ・Alcohol sanitizing after each guest interaction (including disinfection of Room keys) ・Cashless payment is recommended 【Room Cleaning】 ・Thorough ventilation ・Final wipe-down with a sodium hypochlorite solution 【Staff Health Management】 ・Thorough handwashing and gargling ・Health checks and condition management (including temperature checks before coming to work) ・Mandatory mask-wearing while serving guests *We will continue to make improvements to further enhance the safety and peace of mind of both our guests and staff.*
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