Right Onsen › Gunma › Naganohara
Kawarayu Oyu Hotspring
4.1★ · 908 Google ratings · Naganohara, Gunma · 川原湯温泉 王湯
✓ Day visitors✓ Outdoor bath✓ Kakenagashi
Before you go
Can you bathe here?
Day visitors
✓ YesConfirmed by recent visitor reports
Hours
10:00–18:00From the facility's listing
Tattoos
? Call aheadNo policy stated in the 38 recent reviews we read
Price
¥500 adultConfirmed by recent visitor reports
Time limit
2 hoursReported by two visitors
Bathing
Men and women separateReported by two visitors
How we know this
- Day visitors: A straightforward day-use bathhouse, confirmed by multiple reviewers. · 3 visitors, May 2026 – Aug 2026
- Price: Consistently 500 yen per adult for a 2-hour visit, confirmed across at least six reviews through August 2026. · 6 visitors, Apr 2026 – Aug 2026
- Time limit: Admission includes a 2-hour bathing-plus-rest-room window. · 2 visitors, Apr 2026 – Jun 2026
- Bathing arrangement: Standard gender-separated men's and women's baths. · 2 visitors, Jun 2026 – Aug 2026
The bath
What you’ll find
A rebuilt communal kakenagashi bathhouse at Kawarayu Onsen (relocated for the Yamba Dam project) with small indoor and outdoor sulfurous baths overlooking the dam reservoir, a 2nd-floor tatami rest room, 500 yen for 2 hours, but only 2-3 washing stations that get crowded.
Bath setup
Outdoor bath
✓ YesConfirmed by recent visitor reports
Sauna
✕ NoReported by one visitor
View
RiverConfirmed by recent visitor reports
Spring water
Spring type
calcium-sodium chloride-sulfateConfirmed by recent visitor reports
Bath temperature
43°CReported by two visitors
Free-flowing (kakenagashi)
✓ FullGenuine kakenagashi source-fed water confirmed by five reviewers, though water is diluted since the source runs hot; one 2026-08 reviewer also found hair and skin debris in the water, questioning freshness on a busy day.Fresh spring water flows continuously through the bath
Water added
✓ YesReported by two visitors
How we know this
- Outdoor bath: A small outdoor bath alongside the indoor bath, confirmed repeatedly. · 6 visitors, Apr 2026 – Aug 2026
- Sauna: No sauna. · 1 visitor, Jun 2026
- View: The outdoor bath overlooks the Yamba Dam reservoir, though trees partially obstruct the view for some visitors. · 4 visitors, May 2026 – Jun 2026
- Spring type: A calcium-sodium chloride-sulfate spring with a faint sulfur smell; one reviewer instead described it as an alkaline sulfur spring, a minor classification discrepancy. · 3 visitors, Apr 2026 – Aug 2026
- Bath temperature: The indoor bath runs about 43°C and the outdoor bath slightly cooler at about 42°C, per two consistent reviewers. · 2 visitors, Apr 2026 – May 2026
- Free-flowing (kakenagashi): Genuine kakenagashi source-fed water confirmed by five reviewers, though water is diluted since the source runs hot; one 2026-08 reviewer also found hair and skin debris in the water, questioning freshness on a busy day. · 5 visitors, May 2026 – Aug 2026
- Water added: Two reviewers note the hot source water is diluted with added water before reaching the bath. · 2 visitors, Apr 2026 – Jul 2026
Practical
What you need
Soap & shampoo
✓ ProvidedConfirmed by recent visitor reports
Lockers
✓ FreeConfirmed by recent visitor reports
Hair dryer
✓ YesConfirmed by recent visitor reports
Facilities
Rest area
✓ YesConfirmed by recent visitor reports
Restaurant
✕ NoReported by two visitors
How we know this
- Soap & shampoo: Shampoo and body soap are consistently provided, confirmed across at least six reviews. · 6 visitors, Apr 2026 – Aug 2026
- Lockers: Small valuables lockers are free (coin-return style); a separate larger paid locker costs 100 yen, though reviewers disagree on whether that coin is returned. · 3 visitors, May 2026 – Jun 2026
- Hair dryer: Free hair dryers are provided, though one reviewer found the airflow weak and slow to dry. · 5 visitors, Apr 2026 – Aug 2026
- Rest area: A tatami rest room upstairs (2nd floor) is repeatedly praised, though seating is sometimes limited to a couple of chairs plus floor space. · 6 visitors, Apr 2026 – Aug 2026
- Restaurant: No restaurant or food service on site. · 2 visitors, Jun 2026
Timing
When to go
Quietest Tuesday around 10:00. Busiest Sunday around 14:00.
| 8A | 9A | 10A | 11A | 12P | 13P | 14P | 15P | 16P | 17P | 18P | 19P | 20P | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MO | |||||||||||||
| TU | |||||||||||||
| WE | |||||||||||||
| TH | |||||||||||||
| FR | |||||||||||||
| SA | |||||||||||||
| SU |
Quiet Busy
Based on Google visit patterns, not a forecast.
Weekly hours
| Day | Hours |
|---|---|
| Monday | 10:00–18:00 |
| Tuesday | 10:00–18:00 |
| Wednesday | 10:00–18:00 |
| Thursday | 10:00–18:00 |
| Friday | 10:00–18:00 |
| Saturday | 10:00–18:00 |
| Sunday | 10:00–18:00 |
Getting there
How to get there
Nearest station
Kawarayu-Onsen · JR EastAbout 10 min on foot, 0.8 km in a straight line
Address
491 6 Kawarayu, Naganohara, Agatsuma District, Gunma 377-1302From the facility's listing
Show a driver
川原湯温泉 王湯The name in Japanese, for a taxi or at the counter
Phone
+81279-83-2030Japanese-speaking. For tattoos or private baths a call is the only sure answer
Website
www.kawarayu.jpOfficial, in Japanese
The map loads only when you ask for it and connects your browser to Google.
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Questions
Common questions
Can I visit Kawarayu Oyu Hotspring without staying overnight?
A straightforward day-use bathhouse, confirmed by multiple reviewers.
How much does Kawarayu Oyu Hotspring cost?
Consistently 500 yen per adult for a 2-hour visit, confirmed across at least six reviews through August 2026.
Is the water free-flowing spring water?
Genuine kakenagashi source-fed water confirmed by five reviewers, though water is diluted since the source runs hot; one 2026-08 reviewer also found hair and skin debris in the water, questioning freshness on a busy day.
