Kawayu Onsen Kumano
Kawayu Onsen Family Hotels: River Play & Hot Springs in Kumano
A hot spring town in Wakayama's Kumano region where digging into the riverbed reveals natural spring water — river play and private-hire baths for the whole family
Kawayu Onsen is a hot spring town in the Hongu area of Tanabe City, Wakayama Prefecture, close to the UNESCO World Heritage site of Kumano Hongu Taisha Shrine, and it sits along the Oto River. It's known as one of Japan's rare "river hot springs," where digging into the riverbed causes hot water to bubble up — the experience of digging your own open-air bath becomes an unforgettable memory for kids. In winter, the area is also famous for its massive open-air bath, the "Sennin-buro" (hermit's bath), created by damming part of the river.
The appeal for families traveling with kids is being able to enjoy both hot springs and river play in one trip. In summer, you can splash around in the clear waters of the Oto River right in front of the inns, then head straight back to soak in the hot spring once everyone is worn out from playing. It's an area perfectly suited to families who want their kids to play freely in nature.
Kawayu Onsen Tabi no Yado Shiba stands in the heart of the hot spring town and is a private-hire inn with just three rooms in one building, taking only one group per day. You can soak in the natural, source-fed hot spring bath any time you like, 24 hours a day, and spend your stay with just your family, without worrying about other guests. It comes with a kitchen and cooking equipment, plus an all-weather barbecue terrace, so families with young children can enjoy the stay at their own pace. Kawayu Onsen Pension Ashitano Mori is a warm, wood-filled pension built by an owner who runs a forestry business, using cedar and cypress passed down through generations of his family. It has two source-fed private-hire family baths that guests can use free of charge. The pension also offers a toddler-friendly menu, and its home cooking made with home-grown ingredients is well regarded.
Access is easiest by car, and the surrounding area is dotted with UNESCO World Heritage sites families can explore together, including Kumano Hongu Taisha Shrine, the great torii gate at Oyunohara, and the walking trails of the Kumano Kodo pilgrimage route. This hot spring town changes its character with the seasons — river play in summer, the Sennin-buro bath in winter.
Highlights
- checkA rare "river hot spring" where digging into the riverbed reveals hot water, plus summer river play in the Oto River
- checkPrivate-hire inns that take only one group a day, and free private-hire family baths, let you enjoy the trip as just your family
- checkA convenient base for visiting the UNESCO World Heritage sites of Kumano Hongu Taisha Shrine and the Kumano Kodo pilgrimage route
Recommended hotels (1)
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Nearby attractions
Travel tips
If you plan to play in the river in summer, it's reassuring to bring water shoes and a life jacket for your kids. If you dig your own open-air bath in the riverbed, a small shovel makes it even more fun. The famous winter-only Sennin-buro bath opens for a limited season, so check the dates in advance if that's something you're hoping to see. Since getting around the Kumano area often means mountain roads, it's a good idea to prepare for carsickness and build extra time into your schedule.
Best season
Summer (July–August) is for river play in the Oto River, while winter (December–February) brings the famous Sennin-buro bath — each season has its own draw.
Getting there
Access is most convenient by car. If using public transportation, take a local bus bound for Hongu from JR Kii-Tanabe Station or Shingu Station. Kumano Hongu Taisha Shrine is also nearby.
Frequently Asked Questions
What kind of hot spring town is Kawayu Onsen?
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It's a hot spring town in the Hongu area of Tanabe City, Wakayama Prefecture, along the Oto River near Kumano Hongu Taisha Shrine. It's one of Japan's rare "river hot springs," where digging into the riverbed causes hot water to bubble up, and in winter a massive open-air bath called the Sennin-buro appears where part of the river has been dammed. This is a different place from the Kawayu Onsen in Hokkaido, so when booking, be sure to confirm you have the one in Wakayama Prefecture.
Can kids play in the river there?
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Yes. In summer, you can play in the clear waters of the Oto River, which flows right through the hot spring town. Tabi no Yado Shiba is a private-hire inn taking only one group a day, standing right on the Oto River, so you can go straight from river play into the source-fed hot spring bath. When playing in the river, it's reassuring to bring safety gear for your kids, such as water shoes and a life jacket.
Is it easy to stay there with a baby or young child?
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Tabi no Yado Shiba is a private-hire inn taking only one group a day, so you can spend your time as just your family without worrying about other guests, and soak in the hot spring bath any time, 24 hours a day. Pension Ashitano Mori has two free, source-fed private-hire family baths and offers a toddler-friendly menu, making it a reassuring choice for families traveling with young children.