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Atera Valley Rooms Hot Spring Dining Your Journey Sightseeing Four Seasons Access FAQ Contact Book a stay
Atera Valley — light on the water Atera Valley — emerald pool Atera Valley — village summer Atera Valley — drifting Atera Valley — looking from the rocks
NAGANO KISO — ALL SEASONS

Kiso · Nakasendo · Atera Valley

Swim in the emerald river. Walk the Samurai Road.
Taste the river fish, and sleep in the mountain spring.
The rooms are old. But what lies beyond the window is real.

SCROLL
News
2026/02/19SpaDay-trip bath hours updated — please call for details.
2025/07/01TourSummer traffic restriction — private cars are limited during peak season. See Okuwa Village website.
2025/04/01InnUnder new management. We are renovating step by step — thank you for your patience and warmth.
Kiso · Nature & River

Atera Valley

Ten minutes on foot from Aterasou. Within a 6.3 km gorge, the story of "Atera Valley in Emerald-Green" silently breathes.

🚶 10 min walk / 🚗 2 min drive

Atera Valley in Emerald-Green

Atera Valley in Emerald-Green — the legendary clarity

White granite riverbed catches sunlight, and the water glows in a dreamlike blue-green. Locals have long called this color 'Atera Valley in Emerald-Green.' Looking down through the surface, even small pebbles are visible — a clarity that quietly takes one's words away. This is the stream that flows right next to Aterasou.

A walk to Senjojo and Rokudan Falls
🚶 6.3 km along the trail

From Senjojo to Rokudan Falls

From Senjojo to Rokudan-no-Taki

Senjojo — water threading between great rocks. Inugaeri Pool — looked down from the bridge. Unari Island — a gentle widening of the riverbed. Kumagafuchi, Ushigafuchi. Further along, Rokudan Falls. Beneath the protected forest of Kiso's five sacred trees, the Atera River flows in stillness — beauty existing for no one, simply present.

☀️ Mid-July to end of August — closed to private cars

Float, dive, leap

Swim, dive, drift — a summer in atera

In summer, drift with a rubber ring, leap from the rocks, or follow fish with goggles. Between light and shadow, the blue keeps shimmering.
※During peak summer, private cars are restricted — please come on foot or by rental bicycle.See Okuwa Village official guide

More on Atera Valley — Atera Blue, Japan Heritage & Bigan-sui →
Just to be honest
It's an old building. Japanese-style rooms with shared toilets. But it is kept clean, the water is natural hot spring, and the mountains are right outside the window. You don't need to spend much on your lodging — save it for your journey instead. We renovate little by little.
Stay — Rooms

About Aterasou

About our rooms

Aterasou — exterior view
Room: East Wing 10 Tatami (New Wing) Non-Smoking Tatami room with garden view
【Capacity】1–5 guests. Recommended for families with children.
【Room Equipment】Refrigerator, AC, TV, in-room washbasin, tea set, safe
【Amenities】Tanzen jacket, yukata, bath towel, face towel
※The toilet is not in the room. Shared facilities are located in the corridor on each floor.
East Wing 10 Tatami — Non-Smoking
Room: West Wing 8 Tatami (Old Wing) Smoking A cozy tatami room
【Capacity】1–4 guests. For those who smoke.
【Room Equipment】Refrigerator, AC, TV, tea set, vanity, safe
【Amenities】Tanzen jacket, yukata, bath towel, face towel
※The toilet and washbasin are not in the room. Shared facilities are in the corridor on each floor.
West Wing 8 Tatami — Smoking
Facilities

※ The lobby may be crowded during group stays, day-trip bathing, banquets, and similar events. Thank you for your understanding.

Spa — Atera Onsen

Hot Spring

About our natural hot spring "Atera Onsen"

Atera Onsen — the natural hot spring
Atera Onsen — "the heat spring" Natural Onsen Atera Onsen — A natural mineral bath
A silky-smooth touch the moment you slip in. Long called "the heat spring" by locals, it warms you deeply and leaves a gentle warmth in the body long after the bath. Sometimes a wild raccoon dog passes outside the window.
【Quality】Sodium chloride · bicarbonate spring
      Mildly alkaline · hypotonic · low-temperature (filtered, pH 8.0)
【Benefits】Neuralgia, muscle pain, joint pain, frozen shoulder, motor paralysis, joint stiffness, chronic digestive issues, sensitivity to cold, chronic skin conditions, fatigue recovery, general wellness, chronic women's ailments and more
※Please refrain from bathing if pregnant (especially in early or late stages), in acute illness (with fever), with malignant tumors, serious heart disease, respiratory or renal failure, hemorrhagic conditions, tuberculosis, or other progressive conditions.
Atera Onsen — bath area
Hours & Fees Day-trip bath OK Hours, fees & facilities
【Guests】Available all day (except cleaning hours 9:30–12:00)
【Day-trip】12:00–21:00 (last entry 20:00)
   Adult ¥600 / Elementary ¥300 / Infant Free
   Rental bath/face towel ¥200 each, razor ¥100
【Closed】Every Wednesday
【Facilities】Men's indoor bath / Women's indoor bath
   Coin locker (100yen return) · water cooler · blood pressure monitor (lobby)
   Men: 9 wash stations / Women: 6
   Shampoo, conditioner, body soap provided · sample toiletries
※Men's and women's baths may be swapped.
※The women's bath is slightly smaller than the men's. Waiting may occur when busy.
※On group-stay days, day-trip bathing may be limited around 15:00–18:00.
Aterasou lobby — garden-view lounge seating
Dining

About our meals

A table from Kiso
Direct from Misaka Trout Farm
Only what we truly find delicious, served with care.
Just what we genuinely find delicious — with care.

We have no master chef, no head cook. Instead of artistry by a trained craftsman, our family-like staff prepare seasonal ingredients of Kiso in the unpretentious way of the countryside.

We add as little as possible to the gifts of nature, and serve what we ourselves find delicious. With minimal use of artificial flavor enhancers and additives, please enjoy a simple, gentle taste.

Freshwater fish raised in the waters of Kiso, delivered straight from Misaka Trout Farm.
From the trout farm along Misaka River near Magome, the day's catch comes to Aterasou's table. Feel free to ask about mountain stream fishing as well.
Your Journey

A guide for your trip

A few suggested routes — feel free to mix and match.

Summer · River
Nakasendo Hike
Autumn · Kisoji
Fishing · Dining
9:00
Check-in at Aterasou, drop off luggage
From Nagoya by limited express, 1 h 25 min. From Nojiri station, a short taxi ride. Drop bags and head out.
9:30
🏞️ To Atera Valley — 10 min on foot
Spend the day in the emerald stream — swimming, leaping from rocks, hiking. Visit the "beauty spring" listed in Japan's heritage sites.
17:00
Back to Aterasou — natural hot spring
Soak in the natural mineral bath. Outside the window — a view of the mountains.
19:00
🐟 Dinner — river fish from Misaka Trout Farm
Trout raised in the same Kiso waters, served at a mountain inn.
Next morning
On to Tsumago / Magome, or homeward
40 min drive to Tsumago post town, or head back toward Nagoya.
Day 1
Magome → Tsumago hike
One of the most beautiful sections of the Nakasendo. 8 km, 3 hours on a stone path — loved by international travelers as the 'Samurai Road.'
Evening
Back to Aterasou — natural hot spring
Soak tired legs in the bath. From ¥8,000 without meals.
Day 2
Atera Valley or Kakizore Valley
A walk, or a dip in the river. Choose to your mood.
Early morning
🍁 Autumn hike at Atera Valley
The quiet gorge at dawn. Emerald water against autumn leaves — a sight you find nowhere else.
Afternoon
Wander Tsumago post town
Streets touched by autumn color. A quiet atmosphere, made for unhurried walking.
Dinner
Autumn ingredients × river fish
Seasonal mountain ingredients and fresh trout from Misaka Trout Farm. Taste Kiso's autumn.
Early morning
🎣 Mountain stream fishing in Atera Valley / Kiso River
A stream where amago and iwana live. So clear, you can see the fish.
Noon
Magome — visit Misaka Trout Farm
Where amago, iwana, and rainbow trout are raised. Those very fish appear on your dinner table.
Dinner
🐟 Direct from Misaka — a dinner of river fish
The river where they're caught, the river where they're raised — the same river. Kiso water shapes one table.
Sightseeing — Heritage Route

Sightseeing

A short trip from Aterasou — the history and culture of Kisoji along the Nakasendo road, Tsumago, Magome and beyond.

Narai post town · Nakasendo
🚗 15–20 min by carWalking the NakasendoNakasendo — Samurai Road
A 'samurai road' once traveled by Edo-era lords. Wooden bridges of Narai post town still echo the old days. A favorite for international travelers too.
Tsumago / Magome post towns
🚗 40–50 min by carTsumago / MagomeTsumago / Magome
One of Japan's three great post towns. Edo-era streetscapes preserved and unspoiled — calm and atmospheric.
Kamikochi
🚗 About 1 hour to MatsumotoMatsumoto Castle · KamikochiMatsumoto / Kamikochi
A bit north — the national-treasure Matsumoto Castle and the mountain resort of Kamikochi. A popular route: Nagoya → Kisoji → Matsumoto.
Four Seasons

Kisoji through the year

Each season brings a different face — a reason to return.

Spring
SpringSpring
Magnolia blossomsFresh-green hikesWild mountain greensTrout season opens
SummerSummer
River play & swimRock jumpingCampingBBQ
Autumn
AutumnAutumn
Atera in autumn colorTsumago foliage roadMushroom dishesNakasendo Hike
Winter
WinterWinter
Snow sceneryCentral Alps peaksOnsen daysSkiing
INSTAGRAM @ateraso_kiso (coming soon)
Access

How to reach us

Address
〒399-5504
939-58 Nojiri, Okuwa-mura, Kiso-gun, Nagano

TEL: 0264-55-4455
FAX: 0264-55-2234
By train
From JR Chuo Main Line "Nojiri Station"
by taxi or community bus

Nagiso Sightseeing Taxi (Okuwa Stn area)
0264-55-4155
Nagoya → Limited Express Shinano → about 1 h 25 min / ¥3,710
By car from Nagoya
Chuo Expressway → Nakatsugawa IC →
Route 19 (toward Matsumoto, about 30 min) →
Turn left at "Atera Valley Entrance" signal, 3 km
By car from Tokyo / Matsumoto
Chuo Expressway → Nagano Expressway → Shiojiri IC →
Route 19 (about 30 min from Kiso-Fukushima) →
Three intersections past Michi-no-Eki Okuwa,
turn right at "Atera Valley Entrance" signal, 3 km
You can also continue toward Matsumoto / Kamikochi
FAQ

Frequently asked

Is the toilet shared?+
Yes — tatami rooms share a corridor toilet and washbasin. We promise to keep them clean, and we plan to renovate in future.
Can I use the bath for a day-trip visit?+
Yes, day-trip bathing is available during certain hours. Please call (0264-55-4455) for current hours.
How do I reach Atera Valley?+
10 minutes on foot or 2 minutes by car from the inn. During summer there may be private-car restrictions (please check Okuwa Village website).
Can I do mountain stream fishing?+
Mountain stream fishing is available around Atera Valley and the Kiso River. Please call us about fishing gear and permits. We can also share information about our affiliated Misaka Trout Farm (Magome).
For foreign visitors — English support?+
Basic English communication is available. We welcome international guests exploring the Nakasendo (Samurai Road), Tsumago, Magome and Kamikochi. English page coming soon.
🚗 Visiting Atera Valley this summer? Reserve parking in advance →