Nurukawa Seseragi Onsen: A Quiet Valley Hot Spring Inland from the Shimanami Kaido
Most cyclists picture the Shimanami Kaido as a coastal ride, but a short trip inland from Imabari leads to a completely different landscape: a quiet river valley called Nurukawa Onsen. Nurukawa Seseragi Koryukan is the local day-use bathhouse here, an easy way to spend a rest day or a rainy afternoon away from the bridges and the sea.
Why come here
If Shimanami Onsen Kisuke no Yu, right by Imabari Station, is the easy and convenient soak for cyclists finishing their ride, Nurukawa Seseragi Onsen is its opposite number: a small, old-fashioned hot spring tucked into a river valley, used mostly by local families rather than tourists. The appeal is simple. Admission is cheap, the alkaline water is famously smooth on the skin, and the open-air bath sits right beside a clear mountain stream, so you soak to the sound of running water instead of traffic. It is not a polished resort — it is a real neighbourhood onsen, which is exactly why it is worth the detour on the right day.
Inside the bathhouse
Nurukawa Seseragi Koryukan is a municipal facility, first opened in 1996 and renovated in 2019, so the building is functional rather than fancy. The main bathing hall has an indoor tub and an open-air bath beside the river, plus washing stations with enough hot water and shower pressure to rinse off properly after a hot, sweaty ride. There is a rest corner for lounging between soaks, a small direct-produce corner selling local farm goods, and, since 2021, a second-floor aquarium with around 70 varieties of medaka (Japanese killifish) — a nice five-minute stop if you are travelling with children. Rentable tent saunas were added the same year for anyone who wants a longer stay. The on-site diner, Seseragi Shokudo, serves simple lunch food during opening hours, a cheap and easy place to refuel before heading back toward the coast.
The water in the river is clean and clear enough that you can see straight to the bottom, and the current is gentle — a good spot to dip tired feet after a long soak, or to cool off before the ride back on a hot afternoon.
It sits closer to Imabari than the other bathhouses scattered through the Nurukawa valley, so it can draw a few more local visitors on weekends — still quiet by city standards, but a weekday afternoon is your best bet for having a tub to yourself.
The water and the valley
Nurukawa is counted among the “three hot springs of Iyo” (Iyo no Santo) alongside the famous Dogo Onsen in Matsuyama, and the area has been used as a spa retreat since at least the Edo period, when it served the Imabari domain. Local legend even traces its discovery back to the Nara period. The spring itself is drawn from around 300 metres underground, first tapped in 1989, and is a low-tonicity, alkaline cold mineral spring with a pH of about 9.9, containing radon and fluorine. Locals credit that mineral content for the water’s smooth, almost slippery texture, and the whole Nurukawa valley has long been nicknamed the “beauty-skin” hot spring as a result. Treat that, as with any traditional description of hot-spring benefits, as local lore rather than a medical claim.
Rates and hours
Bathing hours are 10:30am to 9:00pm, with last entry at 8:30pm; the snack corner runs 11:00am to 2:30pm. The facility closes on the second and fourth Monday of each month (shifting to the next weekday if that Monday is a public holiday), plus December 31 and January 1. Admission is 420 yen for adults (junior-high age and up), 340 yen for seniors 65 and over, and 210 yen for both children (age 3 to elementary school) and visitors with a disability. These are current rates confirmed directly with the facility, but hours and prices can still change, so check the official website before you go.
Getting there from JR Imabari Station
By taxi: The simplest and most reliable option — about 20 minutes from JR Imabari Station.
By bus: Setouchi Bus runs the Kuzutani/Kamimori line (今治営業所～神子森) with a stop called “Nurukawa Onsen,” roughly 38 minutes from Imabari Station. Departures are limited to a handful a day, so check the Setouchi Bus timetable before you plan around it — do not assume you can simply turn up and catch one.
By car: About 20 minutes from Imabari Interchange, following the valley road past the Tamagawa Dam turn-off.
Map: Open in Google Maps (218-1 Nurukawa-kō, Tamagawa-cho, Imabari)
For cyclists: This is not a stop to fold into a riding day — it sits well off the Shimanami route itself, up a valley road away from the bridges. Save it for a day you are not on the bike.
A rest-day plan for the valley
Because Nurukawa sits inland, away from the sea and the bridges, it pairs naturally with a non-riding day. One simple loop: pick up a bike or a car in the morning at the Imabari rental cycle terminal, spend an hour or two at Noma-uma Highland to see Japan’s smallest native horse breed, then finish at Nurukawa for a long soak before dinner back in town. If you would rather stay close to the station, Kisuke no Yu is the faster, easier alternative — Nurukawa trades that convenience for quiet and scenery. A stop at Imabari Castle also fits well on the same day if you are based in the city centre.
Good to know before you go
Do I need to bring my own towel and soap? Visitor reports say shampoo and body soap are not supplied in the bathing area, so bring your own or budget a small extra fee to rent them, along with a towel, at the front desk.
Is there a locker fee? Yes — the coin-return lockers in the changing room cost 10 yen.
Is there food? Yes. The on-site Seseragi Shokudo serves simple meals during snack-corner hours (11:00am–2:30pm), and there is a small produce stall as well.
Is it good for kids? The medaka aquarium upstairs is an easy add-on for families, and the shallow, clear river beside the open-air bath is a natural spot for supervised play in summer.
Can I use a tent sauna? Rentable tent saunas have been available since 2021. Ask at the front desk, since availability and cost are best confirmed on-site.
Facility information
Nurukawa Seseragi Koryukan (鈍川せせらぎ交流館)
Address: 218-1 Nurukawa-kō, Tamagawa-cho, Imabari City, Ehime 794-0121
Tel: 0898-55-4477
Bathing hours: 10:30am–9:00pm (last entry 8:30pm); snack corner 11:00am–2:30pm
Closed: 2nd & 4th Monday of the month (next weekday if a holiday), Dec 31, Jan 1
Official website: seseragi-onsen.com
Please check the latest hours and prices before visiting, as they may change.
Original article in Japanese: 「鈍川せせらぎ交流館」営業時間＆料金は？川に降りれてトロトロのお湯が楽しめる温泉
