Sukkan-sawa Gorge: Shiobara's Blue Stream and Waterfall Walking Trail
Sukkan-sawa is a gorge deep in the Shiobara Onsen area of Nasushiobara, Tochigi Prefecture, where you can enjoy waterfall walks beside a pale blue stream known as “Sukkan Blue.”
The main activity is walking the Yūhi-no-taki-sen Trail along the stream, taking in the water's colors, exposed rock, and changing forest scenery.
Sukkan-sawa is one of the headwaters of the Kanomata River, a tributary of the Hōki River, and its gorge and forest have drawn visitors since the Meiji period as a “hidden gem of Shiobara.”
This guide covers the highlights of its 3 waterfalls, trail closures and accessible sections, how to get there, and what to wear.
Why Is the Water “Sukkan Blue,” and How Does the Light Change Its Color?
With its headwaters in the former Takaharayama caldera, the stream contains abundant volcanic substances, including minerals and carbonic acid, that make the water appear pale blue in places.
Known as “Sukkan Blue,” this color looks different depending on the sunlight, cloudy or rainy weather, and time of day.
Rather than looking only for the same shade of blue seen in photos, take in the water together with the surrounding rocks and trees to appreciate the gorge as a whole.
The Name Sukkan-sawa Comes from “Sour, Pungent Stream”
The stream was reportedly once called “Su-karai-sawa,” meaning a sour, pungent stream, because its water was too harsh to drink, and this name gradually changed to Sukkan-sawa.
The water's high volcanic mineral content is thus reflected in the gorge's distinctive name.
Avoid tasting the stream water, and prepare drinks for your walk before setting out.
In 1890, the businessman and man of letters Oku Randen described the beauty of Sukkan-sawa in detail in Enkei Kishō, his book introducing Shiobara.
Partly because this book was written in a classical Chinese style, the gorge's waterfalls have names written with difficult kanji characters.
Sukkan-sawa Waterfalls: What to See at Soren, Nisaburō, and Yūhi Falls
Soren Falls, Nisaburō Falls, and Yūhi Falls each have distinctive cascades and surrounding rock formations.
Walking along the Yūhi-no-taki-sen Trail from the parking area, you reach Soren Falls, Nisaburō Falls, and Yūhi Falls in that order.
Follow the access restrictions in place on the day, and enjoy matching each waterfall's name to its scenery.
Soren Falls: Water Seeping Down the Rock Like a Bamboo Blind
At Soren Falls (Soren-no-taki), numerous ribbons of water descend the rock face on the opposite side of the trail.
This is a type of waterfall called a senryūbaku, where underground water emerges from a rock face and cascades down.
It is also called “Sudare Falls” because the white threads of water resemble a blind covering the rock.
A sudare is a Japanese sunshade made from thin bamboo strips or similar materials; picturing its shape helps explain the name.
When the trees are in full leaf, the entire waterfall can be difficult to see, so listen to the water as well as looking at it.
Nisaburō Falls: The White Skirt of “Dancing Maiden Falls”
Nisaburō Falls (Nisaburō-no-taki) is said to be named after the person who first discovered it.
It is also known as “Maihime-no-taki,” or Dancing Maiden Falls, because the water dropping into its ballroom-like plunge pool resembles a maiden wearing a white skirt.
Besides the view down to the waterfall from the trail, look for the gorge scenery where Sukkan-sawa makes a sharp bend downstream.
Watching how the water spreads and moves toward the plunge pool reveals a different character from the fine parallel strands of Soren Falls.
Yūhi Falls: Look Down on a Drop of About 15 m from the Viewing Platform
Yūhi Falls (Yūhi-no-taki) lies in a rocky enclosure, with a viewing platform above the waterfall overlooking its flow.
The drop is about 15 m, and the water resembles a shaft of light entering a dim, rock-lined space; its name is said to reflect beauty so captivating that visitors forget the setting sun.
A kanbakudai is a lookout built for viewing a waterfall.
In 1920, Hasui Kawase, an artist known for shin-hanga woodblock prints, depicted this waterfall in a print titled Yūhi Falls, Shiobara.
There are no signs along the stream route leading below the waterfall, and conditions change with rising water and other factors, so stay on the trail and enjoy the view from accessible paths and the viewing platform.
Near Sukkan Bridge: A Giant Katsura Tree and Columnar Rock Formations
Near Sukkan Bridge, which spans Sukkan-sawa, you can see a giant katsura tree resembling a great serpent that Oku Randen described as “Mōkatsu-keiju.”
Giant katsura and Japanese wingnut trees are scattered through the gorge's woods, which are regarded as a valuable forest within Nasushiobara.
Beyond Sukkan Bridge stands Naginata-iwa, a rock formation with columnar joints created when lava from Takaharayama cooled and split into pillars.
The section beyond Naginata-iwa remains closed, so follow local signs and view the gorge's rock faces from accessible areas.
How to Get to Sukkan-sawa and the Yūhi-no-taki-sen Trail Parking Area
Plan to travel by car and start your walk at the Yūhi-no-taki-sen Trail parking area.
There is no public transportation to the site.
From Shiobara Onsen Visitor Center in the hot spring town, the trail parking area is about 18.9 km via the Nichien Momiji Line, or roughly 45–55 minutes by car.
Arrange Transportation to and from the Trailhead, as There Is No Public Transit
When setting your destination on a map, check the location of the parking area where you will start walking, as well as “Sukkan-sawa,” which may indicate the whole gorge.
Arranging travel by car from your accommodation and back after the walk makes it easier to organize your overall trip.
Saving the Japanese facility names on your device is also helpful when discussing transportation.
Restrooms may not be available along the trail or at the parking area, so use facilities in the hot spring town or elsewhere before departing.
Check Winter Closures on Prefectural Route 56 Separately from Trail Closures
The Shiobara–Yaita Road, Prefectural Route 56 leading to Sukkan-sawa, normally closes for winter from early December to late March.
The winter closure runs from 11:00 a.m. on December 1, 2026, to 11:00 a.m. on March 26, 2027, between the area near the Shio-no-yu and Amayu Forest Road junction in Shiobara, Nasushiobara, and Gakkōdaira in Shimoisano, Yaita, near Yama-no-Eki Takahara.
Do not decide to set out based only on trail information; you also need to confirm that you can reach the entrance by car.
Prioritize Tochigi Prefecture's road information and local restriction signs over the route suggested by your navigation system.
Sukkan-sawa Trail Closures and Accessible Walking Sections
When planning a Sukkan-sawa walk, checking which trail sections are open is just as important as researching the scenery.
Fallen trees, landslides, and other factors can change the accessible area, so avoid planning your route using only an old map.
In fact, the entire Yūhi-no-taki-sen Trail was temporarily closed because of fallen trees and landslides.
Yūhi-no-taki-sen Trail Is Open to Sukkan Bridge; Beyond Naginata-iwa Remains Closed
Restoration work has progressed on the Yūhi-no-taki-sen Trail, and the closure has been lifted as far as Sukkan Bridge.
You can therefore walk from the parking area past Soren Falls, Nisaburō Falls, and the Yūhi Falls viewing platform to Sukkan Bridge.
However, the section from Naginata-iwa to the junction with the Maeyama–Happōgahara Trail remains closed.
Allow about 3 hours, excluding breaks, for the roughly 3 km round-trip walk on the Yūhi-no-taki-sen Trail.
Before setting out, check access information from the prefecture or Shiobara Onsen Visitor Center, and choose your turnaround point according to local signs.
Information on Shiobara trail closures is available on the Tochigi Prefectural Northern Environment and Forestry Office website and the website of Shiobara Onsen Visitor Center in the Fukuwata district of Shiobara, Nasushiobara.
Check Connecting Trails Before Extending Your Walk to Raitei and Hōkō Hekireki Falls in Sakurazawa
Hōkō Hekireki Falls is at the confluence of Sukkan-sawa and Sakurazawa, while Raitei Falls, about 10 m high, is on Sakurazawa.
However, trails that appear connected on a map are not necessarily open for through access.
Because the Yūhi-no-taki-sen Trail is closed beyond Naginata-iwa, you cannot walk through from Sukkan-sawa toward the confluence.
The Maeyama–Happōgahara Trail is also listed as closed between Hōkō Hekireki Suspension Bridge and the Shio-no-yu area.
If you want to combine Sukkan-sawa with another route, check whether the connecting sections are open too.
Avoid bypassing closed sections along the stream or over slopes, and adjust your plans to stay within the available trails.
Understand Japanese Warning Signs Before Continuing
If you cannot read a sign, check its meaning with a translation tool or similar aid before taking action.
Here are common warning signs you may encounter while walking and how to respond.
| Sign | Meaning | What to Do |
|---|---|---|
| Trail closed | No access beyond this point | Do not continue |
| No entry | Access to the area is prohibited | Do not cross the boundary |
| Beware of falling rocks | Risk of falling stones | Check your surroundings and footing |
| Watch your step | Risk of trips or falls | Take smaller steps |
Sukkan-sawa Through the Seasons: Fresh Greenery and Autumn Leaves
At Sukkan-sawa, looking at the forest's colors as well as the water lets you enjoy the differences between seasons.
When choosing your visit date, consider both the scenery you want to see and the road and trail conditions at that time of year.
Fresh Spring and Summer Greenery: Enjoy the Colors of Forest and Water
When the leaves are bright, take in the trees and pale blue stream together.
As the greenery grows denser, branches and leaves may block parts of the view, but the sound of water and the shade of the trees are also part of the walk's appeal.
Do not leave the trail to find a better view of a waterfall; appreciate the scenery visible from where you are.
Adjust Your Sukkan-sawa Autumn Foliage Plans to the Changing Colors
Autumn is a season for viewing colorful trees together with the rock faces and flowing water.
In nearby Happōgahara, autumn leaves usually peak from around mid-October to early November.
The progress of autumn colors varies with weather and other factors, so checking local updates as your trip approaches helps with planning.
Here are some ways to enjoy the views as the forest changes.
| Forest Conditions | What to Notice | How to Enjoy It |
|---|---|---|
| Fresh spring greenery | Young leaves and water colors | Look at the overlapping colors |
| Dense greenery | Tree shade and the sound of water | Listen as well as look |
| Autumn leaves | Contrasts between leaves, rocks, and water | Take in the wider surroundings |
What to Wear and Bring for Sukkan-sawa, Plus Photography Etiquette
Come to Sukkan-sawa prepared for a walk on mountain trails.
Wear hiking shoes and stay alert for sudden changes in the weather.
Choose Suitable Shoes and Rain Gear, and Keep Your Hands Free
Well-fitting hiking shoes and a backpack make walking easier.
Prepare your belongings with changing weather and your return journey in mind.
- Rainwear that covers your body and an outer layer suited to the temperature
- Drinks and snacks to eat during the walk
- A charged mobile phone and saved maps
- Bags for carrying out trash and wet items
Shiobara is also bear habitat, so carry something that makes noise, such as a bell, while walking.
Shorten Your Walk if Rain or Rising Water Is a Concern
Sukkan-sawa lies in the upper reaches of a gorge, so sudden weather changes such as localized heavy rain can cause water levels to rise quickly.
If the weather looks likely to deteriorate or you are concerned about trail conditions, turn back rather than insisting on reaching your chosen waterfall.
Leave time for photography and breaks, and plan to finish your walk while it is still light.
Check Your Footing and Other Walkers Before Taking Photos
Stop when taking photos, and check your footing and the movement of other walkers.
As a general courtesy, avoid blocking narrow paths or bridges for long periods, and take photos without stepping onto vegetation or moving branches.
Rather than descending to the water's edge for a wider angle, prioritize finding a composition from somewhere you can stand safely.
Follow nature park etiquette by not collecting plants or wildlife without permission.
Planning Your Sukkan-sawa Waterfall Walk
Sukkan-sawa is a walking destination in Shiobara where you can enjoy a pale blue stream known as Sukkan Blue, 3 distinctive waterfalls, and forest scenery.
The Yūhi-no-taki-sen Trail is walkable as far as Sukkan Bridge, but the section beyond Naginata-iwa remains closed.
Before visiting, check both trail and road access information, prepare suitable walking gear, and arrange your return transportation.
Walking according to the day's weather and accessible sections leaves you free to appreciate the waterfalls' names, the sound of water, and the season's colors.
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