The Koya Ryujin Skyline is a spectacular mountain road that forms part of National Route 371, connecting the Okunoin intersection in Koya Town, Ito District, Wakayama Prefecture, with Ryujin Village in Tanabe City. Stretching approximately 42.7 kilometers, the route winds through the mountainous interior of the Kii Peninsula, offering magnificent scenery and access to historic religious sites, mountain landscapes, and hot spring destinations.
Originally operated as a toll road, the Koya Ryujin Skyline became toll-free on October 1, 2003. Since then, it has become a popular route for sightseeing by car and motorcycle, attracting visitors who want to explore the natural beauty of the Kii Mountains at their own pace.
The road opened to traffic on July 21, 1980, as a toll road managed by the Wakayama Prefectural Road Corporation. Although part of the route passes through Nara Prefecture, the entire road was managed by the Wakayama organization.
For many years, the road struggled to achieve profitability. Toll collection ended on October 1, 2003, when the prefecture arranged to repay the outstanding debt in a lump sum. The decision was also influenced by preparations for the anticipated World Heritage inscription of the Sacred Sites and Pilgrimage Routes in the Kii Mountain Range. Improving access for private vehicles and tour buses was considered important for encouraging tourism and helping visitors reach the region’s historic religious sites.
The road subsequently became an important part of the area’s tourism network, linking Koyasan with the mountains around Gomadan and the hot spring resort of Ryujin Onsen.
The Koya Ryujin Skyline follows mountain ridges at elevations of around 1,000 meters or more. Traveling south from Koyasan, the route passes through the highlands around Mount Gomadan before descending toward Ryujin Onsen, a celebrated hot spring destination known for its traditional atmosphere and skin-soothing waters.
The road crosses the mountainous western part of the Kii Peninsula and is popular with drivers and motorcyclists. Its winding layout features tight hairpin bends, sweeping curves, and repeated changes in elevation, making it an engaging route for those who enjoy mountain driving. During weekends and holiday periods, traffic can become heavy, particularly in spring and autumn when the scenery is especially attractive.
The elevated route offers expansive views across the Kii Mountains. Seasonal changes in the vegetation create a different landscape throughout the year. Spring brings fresh green leaves, summer fills the mountains with deep greenery, and autumn transforms the slopes into a colorful display of red, orange, and yellow foliage.
Autumn is particularly popular with sightseeing visitors, who come to enjoy the mountain colors from the road and nearby viewpoints. Because of the route’s elevation, seasonal changes can occur at different times along the drive, adding variety to the scenery.
The northern end of the skyline is at Koyasan, one of Japan’s most important centers of Buddhist practice and a major component of the UNESCO World Heritage property Sacred Sites and Pilgrimage Routes in the Kii Mountain Range. The surrounding region is also associated with the historic Kumano Kodo Kohechi pilgrimage route, which connects Koyasan with the Kumano Sanzan shrines farther south.
Although the skyline is primarily a modern road for vehicles, its location makes it a convenient way to explore the wider landscape of sacred mountains and pilgrimage traditions. Travelers can combine a drive with visits to temples, mountain viewpoints, and hot springs to experience both the natural and cultural heritage of the Kii Peninsula.
Constructing the road along high mountain ridges required significant changes to the natural terrain. Environmental concerns were raised, particularly regarding the beech forests around Mount Gomadan. Changes associated with construction contributed to tree decline in some areas, highlighting the delicate balance between tourism infrastructure and mountain ecosystems.
Although the situation has eased in some respects, the area remains environmentally sensitive. Visitors can help protect the landscape by staying on designated paths, avoiding damage to vegetation, and following local guidance when exploring the surrounding forests.
Because the road passes through high elevations, winter weather can bring snow and icy conditions. Seasonal restrictions generally apply from mid-December through late March. During this period, motorcycles may be prohibited, while four-wheeled vehicles may be required to use tire chains.
Nighttime closures have also been imposed, with the road closed from 5:00 p.m. until 7:00 a.m. under the regulations described for this route. Restrictions can vary according to weather and road conditions, so check the latest official road information before setting out. Allow plenty of time for the drive, particularly during winter or busy foliage seasons.
Near the midpoint of the route, Roadside Station Tanabe City Ryujin Gomadansan Sky Tower offers a convenient place to rest and enjoy the mountain scenery. Its 33-meter observation tower is designed to resemble a traditional gomagi, a wooden stick used in Buddhist fire rituals. From the observation area, visitors can take in sweeping views of the Kii Mountains.
The roadside station is a popular stop for drivers and motorcyclists, providing an opportunity to stretch their legs and appreciate the landscape before continuing along the winding road.
Near the southern end of the skyline, Roadside Station Ryujin is another useful stop. Visitors can learn about local specialties and obtain information about nearby hot springs and sightseeing destinations. It is a convenient place to pause before visiting Ryujin Onsen or continuing to explore the surrounding mountain villages.
Several notable destinations lie along or near the route, including Koyasan, Mount Gomadan, Ryujin Onsen, and the Kohechi section of the Kumano Kodo pilgrimage network. These places offer a combination of Buddhist heritage, mountain scenery, hiking opportunities, and traditional hot spring culture.
The Koya Ryujin Skyline runs broadly north to south along the mountainous area near the border between Wakayama and Nara prefectures. Much of the drive passes through forested ridges, with stretches of road offering relatively open views across the surrounding mountains.
In Wakayama Prefecture, the route passes through Koya Town, Katsuragi Town, Aridagawa Town, and Tanabe City. In Nara Prefecture, it passes through Nosegawa Village. Between the Nosegawa entrance intersection and Mount Gomadan, the road crosses the prefectural boundary several times.
Koyasan is a historic Buddhist center and a key destination for religious travelers. Mount Gomadan is known for its high mountain setting and surrounding forests. Ryujin Onsen is famous for its traditional hot spring atmosphere and is often promoted as a beauty bath. The Kumano Kodo Kohechi is a historic pilgrimage route associated with the sacred sites of the Kii Mountains, although parts of the old route were affected by road construction. Mino Pass is another geographical landmark in the surrounding mountain area.
The Koya Ryujin Skyline is more than a scenic drive. It connects the historic religious center of Koyasan with the forests, highlands, and hot springs of the southern Kii Mountains, providing a gateway to a region where nature and centuries of spiritual tradition remain closely linked.
Whether you are traveling by car, enjoying a motorcycle tour, admiring autumn foliage, or visiting the area’s World Heritage sites, the skyline offers a memorable way to explore this mountainous part of Japan. Plan ahead for seasonal road conditions and allow time to stop at viewpoints and roadside stations along the way.