Agatsuma Gorge is a spectacular gorge extending along the middle reaches of the Agatsuma River between Higashiagatsuma Town and Naganohara Town in Gunma Prefecture. Designated a National Place of Scenic Beauty in 1935, the gorge is known as the “Yabakei of Kanto”, a reference to the famous Yabakei Gorge in Oita Prefecture.
The scenery is also celebrated in Jōmō Karuta, Gunma’s traditional card game, with the phrase “Agatsuma Gorge surpasses Yabakei.” It is widely regarded as one of Gunma Prefecture’s most beautiful natural landscapes.
The main scenic section stretches for approximately 2.5 kilometers from the area around Fureai Ohashi Bridge upstream toward Shin-Hōrai. In a broader sense, the gorge extends approximately 3.5 to 4 kilometers from Karigazawa Bridge to Yamba Ohashi Bridge.
Steep rock walls rise along both sides of the river, while the Agatsuma River winds between rapids and deep pools, creating a constantly changing landscape.
The gorge is believed to have been formed when lava produced by ancient volcanic activity was gradually eroded by the waters of the Agatsuma River over immense periods of time. Cliffs reaching around 50 meters in height, unusual rock formations, and waterfalls can be seen throughout the gorge, offering visitors an opportunity to experience the power of nature up close.
One of the greatest attractions of Agatsuma Gorge is the way its scenery changes with each season. Trees such as maples, sawtooth oaks, Japanese hornbeams, and Japanese red pines cover the slopes, creating a different atmosphere throughout the year.
From around mid-April, wild Mitsuba azaleas bloom in vivid reddish-purple hues, adding bright color to the gorge. The flower has been designated as the official flower of Naganohara Town and has become an important symbol of the area.
Nearby, cherry trees such as Osumi-zakura and the weeping cherry tree at Ikuha Kannon-do also come into bloom, adding to the beauty of the spring landscape.
By early May, new leaves emerge across the mountains and the entire gorge is enveloped in fresh, vibrant green. Hiking while listening to the sound of the river and feeling the cool breeze is especially refreshing, making this a popular season for photographers and nature lovers.
From late October to early November, Agatsuma Gorge reaches its peak autumn colors. Maples and oak trees turn brilliant shades of red and yellow, transforming the gorge into a landscape resembling a traditional Japanese brocade painting.
The area around Haccho-kuragari and Momijidai is particularly beautiful. During the autumn season, colorful foliage arches overhead like a natural tunnel, creating an almost dreamlike atmosphere for walkers.
Among the most famous attractions of Agatsuma Gorge are the “Ten Scenic Highlights of Agatsuma Gorge”, known in Japanese as Agatsuma-kyō Jisshō. These ten locations consist of distinctive rock formations, pools, cliffs, and other natural features scattered throughout the gorge.
Each has its own distinctive appearance and story, and together they represent the extraordinary natural beauty of the gorge. They are also popular viewpoints for hikers and photography enthusiasts.
One of the most famous sights is Shika-tobi, or “Deer Leap.” Here, the river narrows to only about 2 to 3 meters wide, while steep rock walls rise dramatically on both sides.
The narrow passage is combined with a deep pool of approximately 50 meters, creating one of the most dramatic landscapes in the gorge.
The name comes from a local legend that deer once leapt across this narrow rocky section. The combination of the deep, clear water and towering cliffs provides a powerful impression of the forces of nature.
Haccho-kuragari is a section where the cliffs and trees on both sides seem to lean over the gorge, making it feel surprisingly dark even during the daytime.
In autumn, red and yellow leaves form a canopy overhead, creating a natural tunnel filled with beautiful colors. It is one of the landscapes most strongly associated with the beauty of Agatsuma Gorge.
Byōbu-iwa, or “Folding-Screen Rock,” is named for its immense rock wall, which resembles a traditional Japanese folding screen standing upright.
The nearly vertical rock face has a powerful presence and illustrates the grandeur of the gorge’s natural formations. The contrast between the rock wall and the surrounding seasonal foliage also makes it a popular photography location.
Hotei-iwa is a huge rock wall approximately 70 meters high. Its rounded form is said to resemble the figure of Hotei, one of the Seven Lucky Gods of Japan, giving the rock its name.
It stands out prominently among the surrounding cliffs, and looking up from below gives visitors a strong sense of its immense scale.
Ryūtō-iwa and Ryūbi-iwa are unusual rock formations whose shapes are said to resemble the head and tail of a dragon.
Shaped by natural erosion over countless years, these rocks stimulate the imagination. Their rugged surfaces, changing shadows, and reflections on the river create especially attractive scenery.
Momijidai is a popular viewpoint known for its spectacular autumn colors. In fall, the surrounding mountains turn vivid shades of red and yellow, offering expansive views across the gorge.
It attracts many visitors during the foliage season, and the scenery is particularly impressive on clear days.
The area around Saruhashi Bridge is another scenic highlight of the gorge. From the bridge, visitors can enjoy the contrast between the clear river and the rugged rock walls.
The appearance of the landscape changes throughout the year, making the bridge a pleasant viewpoint in every season.
Fudō-iwa is a massive rock that stands firmly within the gorge. Its solid and immovable appearance is said to have inspired the name “Fudō,” meaning unshakable or immovable.
Standing quietly amid the surrounding scenery, the rock creates a strong contrast with the peaceful atmosphere of the gorge.
Shiraito Falls is a delicate waterfall flowing in a narrow stream between the rocks. Its appearance resembles a thin white thread, which is the meaning of its name.
Unlike the powerful rapids elsewhere in the gorge, the waterfall offers a more delicate and graceful natural scene.
Hōrai-iwa takes its name from Hōrai, a mythical paradise in East Asian tradition. The rock blends naturally with the surrounding landscape and creates a mysterious atmosphere.
The area also evokes the traditional Japanese reverence for natural formations and the spiritual relationship between people and the mountains.
The Ten Scenic Highlights of Agatsuma Gorge can be explored along walking trails. The main route is approximately 2.5 kilometers one way and is relatively well maintained, allowing visitors to enjoy nature observation and photography at a leisurely pace.
The fresh greenery of spring and early summer and the brilliant autumn foliage are particularly impressive, when each scenic landmark takes on an even more distinctive appearance.
Beyond the Ten Scenic Highlights, Agatsuma Gorge has a number of maintained walking trails and viewpoints. The landscape changes dramatically with the seasons, from fresh greenery in spring and clear flowing water in summer to brilliant autumn foliage and the quiet atmosphere of winter.
The trails provide an enjoyable way to observe plants and wildlife, photograph the scenery, and experience the gorge at a relaxed pace.
In the past, Agatsuma Gorge was a difficult natural obstacle dividing Agatsuma District from east to west. As transportation needs increased from the Edo period onward, efforts were made to improve access through the rugged landscape.
In 1895, Noguchi Moshirō invested his own funds to construct what became known as the Noguchi New Road. This road later developed into National Route 145 and played an important role in the development of the surrounding region.
The geographer Shigetaka Shiga praised the gorge as the “Yabakei of Kanto,” while the poet Bokusui Wakayama was also deeply impressed by its scenery and composed poems about the area.
The artist Hasui Kawase also created a woodblock print titled Agatsuma Gorge, further demonstrating the cultural and artistic importance of this scenic landscape.
Completed in 2020, Yamba Dam is a major dam constructed across the Agatsuma River and has become a new landmark in the region.
The massive dam structure makes a powerful impression, while viewpoints offer beautiful views across Lake Yamba Agatsuma. Walking paths and observation facilities around the dam allow visitors to appreciate the scale of modern civil engineering up close.
Combining a visit to the dam with the Agatsuma Gorge Rail Bike “Agattan” is another way to experience the contrast between the former railway line and the newer landscape created around Yamba Dam.
After exploring the gorge, a visit to Roadside Station Agatsuma Gorge is a convenient choice. The adjoining day-use hot spring facility, Tengu no Yu, offers baths using water from its natural hot spring source, while a free footbath and local produce shop provide additional opportunities to relax.
Historic hot spring destinations such as Kawarayu Onsen and Kawanaka Onsen are also located nearby, making it possible to combine a nature walk with a relaxing hot spring experience.
Agatsuma Gorge Onsen Tengu no Yu is a day-use hot spring facility near the entrance to the gorge. Its open-air baths offer views of the surrounding mountains, with particularly beautiful scenery during the autumn foliage season.
Popular with local residents as well as visitors, it is an ideal place to take a break during a sightseeing trip.
Roadside Station Agatsuma Gorge is a popular stop for locally produced foods, fresh vegetables, and regional specialties.
The restaurant serves dishes including okkirikomi, a traditional Gunma noodle dish, along with meals prepared using local ingredients. The facility also serves as a convenient source of local tourism information and is a useful stop during a driving trip through the area.
Kawarayu Onsen is a historic hot spring resort that was relocated to higher ground as part of the Yamba Dam project. It has long been known as a destination for therapeutic bathing.
The gentle natural hot spring water provides a relaxing way to unwind after hiking or sightseeing. Public baths and footbaths also make it easy to enjoy the hot spring culture of the area without requiring a long stay.
Mount Iwabitsu is one of the most recognizable mountains in Higashiagatsuma. Rising approximately 802 meters, its rugged rock faces and distinctive profile make it an impressive sight.
The mountain is also famous for the ruins of Iwabitsu Castle, a Sengoku-period mountain fortress associated with the Sanada clan. This connection makes the mountain particularly appealing to visitors interested in Japanese history.
Several hiking routes are available, ranging from relatively accessible courses to more challenging routes featuring fixed chains. From the summit, hikers can enjoy broad views over the mountains and countryside of the Agatsuma region.
For visitors using public transportation, buses from JR Iwashima Station provide convenient access to the area. By car, Agatsuma Gorge is approximately 40 minutes from either the Kan-Etsu Expressway’s Shibukawa-Ikaho Interchange or Numata Interchange.
Parking areas are available at locations including Roadside Station Agatsuma Gorge and the gorge parking areas.
A relatively easy walking trail runs along the former National Route 145 on the left bank and is suitable for families. Some sections on the right bank are closer to hiking trails, so visitors should wear comfortable walking shoes and make adequate preparations before setting out.
Agatsuma Gorge is a special landscape where dramatic terrain shaped by ancient volcanic activity and the flowing waters of the Agatsuma River come together with the rich natural beauty of the four seasons and the history and culture of the people who have lived in the region.
From spring flowers and fresh early-summer greenery to brilliant autumn foliage, every season offers a different reason to visit.
As one of the most celebrated scenic destinations in the Kanto region, Agatsuma Gorge offers an ideal place to slow down, enjoy the beauty of the landscape, and reconnect with nature.