Hagi Expressway

Hagi Ōkan: The Samurai Highway Connecting Japan's Sea of Japan Coast to the Seto Inland Sea

Stretching approximately 53 kilometers across the mountainous heart of Yamaguchi Prefecture, the Hagi Ōkan (萩往還) is one of Japan's most historically significant and beautifully preserved Edo-period highways. This ancient road runs nearly in a straight line from the castle town of Hagi on the Sea of Japan coast, through the mountains, to the port of Mitajiri (present-day Hōfu City) on the Seto Inland Sea side. Designated as a National Historic Site, the Hagi Ōkan offers visitors an extraordinary opportunity to walk the very same paths once traveled by feudal lords, common people, and the revolutionary samurai who helped shape modern Japan.

A Road Born from Defeat: The Origins of the Hagi Ōkan

The story of the Hagi Ōkan begins with a pivotal moment in Japanese history. After the Mōri clan's devastating defeat at the Battle of Sekigahara in 1600, they were stripped of most of their territories and forced to relocate their seat of power. In 1604, Mōri Terumoto constructed Hagi Castle at the foot of Mount Shizuki on a small delta peninsula facing the Sea of Japan. However, being situated on the remote Japan Sea coast presented a significant logistical challenge: the feudal lords needed to travel to Edo (present-day Tokyo) for the mandatory sankin-kōtai (alternate attendance) system, which required daimyō to spend every other year in the capital.

To solve this problem, the Mōri clan developed the Hagi Ōkan as their official "Onarimichi" (lord's processional route). The highway was engineered to cut through the Chūgoku Mountains as directly as possible, connecting the castle town to Mitajiri Port, where the feudal lord's entourage would board ships for the sea voyage along the Seto Inland Sea toward Edo. The road was built to a width of approximately 4 meters (about 2 ken in traditional Japanese measurement), a substantial width for the era, reflecting its importance as the domain's primary artery.

Why the Hagi Ōkan Is Designated a National Historic Site

The Hagi Ōkan was designated as a National Historic Site (国指定史跡) on September 22, 1989, recognizing its exceptional historical, cultural, and archaeological value. The designation encompasses not just the road itself but also numerous related sites along its route, including milestone markers (ichirizuka), rest stations, stone pavements, boundary markers, and post town remains.

Several factors contributed to this important designation. First, the road preserves remarkably intact sections of original Edo-period stone pavement (ishidatami), most notably the famous Isshōdani stone pavement, where a continuous stretch of approximately 250 meters of original cobblestones was discovered buried beneath the soil during restoration work. Second, the highway played a crucial role during the Bakumatsu period (the final years of the Tokugawa shogunate), when revolutionary figures such as Yoshida Shōin, Takasugi Shinsaku, Kido Takayoshi, and even Sakamoto Ryōma traveled this road as they worked to overthrow the shogunate and bring about the Meiji Restoration.

In 1996, the road was selected as one of Japan's "Top 100 Historical Roads" (歴史の道百選) by the Agency for Cultural Affairs. In 2004, the section between Hagi and Yamaguchi was chosen as one of Japan's "500 Most Beautiful Walking Paths." Furthermore, in 2007, the route was registered as a Japan Scenic Byway (日本風景街道), underscoring its enduring cultural and scenic significance.

Walking Through History: Key Highlights Along the Route

The Hagi Ōkan traverses diverse landscapes ranging from coastal flatlands to mountain passes, with each section offering unique historical and natural attractions. Here are the major highlights travelers will encounter along this remarkable highway.

Karahi Fudaba (Starting Point in Hagi)

The journey begins at the Karahi Fudaba, a reconstructed notice board site located near the center of the Hagi castle town delta. This spot served as the official starting point not only for the Hagi Ōkan but also for several other major highways radiating from the castle town, including the Akama-ga-Seki Highway and the Sekishū Highway. It also functioned as the reference point for all milestone markers throughout the Bōchō provinces (present-day Yamaguchi Prefecture). Official proclamations from the shogunate and the domain government were posted here for public notice.

Namidamatsu (Tear Pine)

Shortly after leaving the castle town, travelers reach Namidamatsu, one of the most poignant spots along the entire route. This was the last point from which departing travelers could look back and see the town of Hagi through the gaps in the pine trees lining the road. Those leaving the castle town would shed tears of farewell here, while returning travelers wept with joy—hence the evocative name "Tear Pine." Most famously, in 1859, the scholar and revolutionary Yoshida Shōin composed a farewell poem at this spot as he was being transported to Edo under arrest during the Ansei Purge, sensing he would never return.

Kasegasaka Ichirizuka (First Milestone Mound)

The Kasegasaka Ichirizuka marks the first ri (approximately 4 kilometers) from the Karahi Fudaba starting point. Built from basalt and filled with earth, this milestone mound is a tangible reminder of the highway's carefully planned infrastructure. A memorial stone erected in 1939 stands on top of the mound. Along the route, additional milestone markers can be found at Kaminagase and Ichinozaka in Yamaguchi City.

Kasegasaka Kago Tateba (Palanquin Rest Station)

At the Kasegasaka Pass, visitors can see a reconstructed kago tateba—a rest station where the feudal lord's procession would pause briefly during their journey. The original facility consisted of two raised platforms for setting down palanquins, enclosed by brushwood fences, along with basic amenities. This reconstruction gives visitors a vivid sense of what travel along the highway was like for the ruling elite.

Isshōdani Stone Pavement

Perhaps the most iconic feature of the entire Hagi Ōkan, the Isshōdani (One-Shō Valley) stone pavement is a stunning stretch of original Edo-period cobblestones running through a steep, densely forested valley. The valley gets its whimsical name from the saying that the slope is so long and steep that a traveler eating roasted beans while climbing would consume an entire shō (approximately 1.8 liters) before reaching the top. The pavement, roughly one meter wide, was ingeniously constructed with large stones placed along the edges and smaller stones filling the interior, designed to prevent erosion from rainwater. Stretches of approximately 45 meters of original pavement remain clearly visible, making this one of the finest surviving examples of Edo-period road engineering in all of Japan.

Sasanami Post Town

Situated roughly midway along the Hagi Ōkan, the village of Sasanami developed as a prosperous post town where the feudal lord would rest at a specially maintained guesthouse (ochaya). The settlement has remarkably well-preserved Edo-period street layouts, with traditional thatched-roof houses and buildings topped with the distinctive reddish-brown Sekishū tiles characteristic of the San'in region. The surrounding terraced rice paddies complement the historical townscape beautifully. In 2011, Sasanami was designated as a Nationally Important Preservation District for Groups of Traditional Buildings, recognizing its outstanding preservation of a feudal-era post town atmosphere.

Itadō Pass and the Provincial Boundary Marker

The Itadō Pass marks the historic boundary between the provinces of Nagato and Suō (now the border between Hagi City and Yamaguchi City). A granite boundary marker erected in 1808 stands here, though historical records suggest an earlier marker existed at this location. Near the pass, travelers can also find the Gyakushū-seki (memorial stones) associated with the nearby Ichinozaka Silver Mine, which was active since the era of the Ōuchi clan, indicating that the area was once a bustling center of mining activity.

Mitajiri Ochaya (Eiunsō) — The Endpoint in Hōfu

The southern terminus of the Hagi Ōkan is the Mitajiri Ochaya, a magnificent official guesthouse built by the second Mōri lord, Mōri Tsunahiro. This stately building served as the feudal lord's lodging and reception hall when the sankin-kōtai procession reached the port. From here, the lord would board a ship at the nearby Mitajiri Ofunakura (naval shipyard) for the sea voyage to Edo. The beautifully maintained gardens and interiors of the Ochaya (also known as Eiunsō) are open to visitors, offering an intimate glimpse into the lifestyle of Edo-period nobility. The entire complex is designated as part of the Hagi Ōkan National Historic Site.

Connections to the Meiji Restoration and Japan's Modernization

The Hagi Ōkan's historical significance extends far beyond its role as a feudal highway. During the tumultuous final years of the Edo period, this road became a lifeline for the revolutionary samurai of the Chōshū Domain (present-day Yamaguchi Prefecture), who were instrumental in overthrowing the Tokugawa shogunate and bringing about the Meiji Restoration of 1868.

Prominent figures who walked this road include Yoshida Shōin, the visionary educator whose students went on to become leaders of modern Japan; Takasugi Shinsaku, who organized the domain's revolutionary militia; Kido Takayoshi, one of the "Three Great Nobles" of the Meiji Restoration; and Itō Hirobumi, who became Japan's first Prime Minister. The nearby Hagi Castle Town, through which the Hagi Ōkan passes, is registered as a UNESCO World Heritage Site as part of the "Sites of Japan's Meiji Industrial Revolution: Iron and Steel, Shipbuilding and Coal Mining."

Walking the Hagi Ōkan thus offers visitors a profound connection not just to Edo-period travel culture but to the very origins of modern Japan.

Practical Guide: How to Walk the Hagi Ōkan Today

The full 53-kilometer route typically takes two to three days to walk completely, so most visitors choose to explore specific sections rather than attempting the entire highway in one trip. The most popular and scenic section runs between the post towns of Akiraigi and Sasanami, a distance of approximately 9 kilometers with an elevation change of about 300 meters, requiring roughly 3.5 hours to complete. This section features the famous Isshōdani stone pavement and offers the most concentrated collection of historical sites.

The route is well marked with blue signposts and tall stone route markers inscribed with "萩往還" (Hagi Ōkan). Rest areas with toilet facilities are available at intervals along the mountain trail sections. However, there are no vending machines or shops on the mountain portions of the route, so bringing water and snacks is essential.

For a richer experience, guided walking tours are available through the Yamaguchi Hagi Ōkan Kataribe no Kai (Storytellers' Association). They offer several courses, including an affordable "One-Coin Tour" (500 yen) on weekends and holidays that provides fascinating historical commentary along the way. Advance reservations are recommended.

When preparing for your walk, wear sturdy, well-broken-in hiking shoes, as the trail includes stone-paved sections and mountain paths that can be slippery. Long sleeves and long pants are recommended for protection against insects, and insect repellent spray is advisable, especially during summer months. A towel and sufficient drinking water are essentials for a comfortable walk.

Surrounding Attractions

The Hagi Ōkan connects three fascinating cities, each with its own wealth of attractions that complement the highway experience.

Hagi City

The northern starting point offers one of Japan's best-preserved castle towns, a UNESCO World Heritage Site. Visitors can explore samurai residences along Kikuya Yokochō (selected as one of Japan's Top 100 Roads), the Shōka Sonjuku Academy where Yoshida Shōin educated future leaders of modern Japan, and the birthplace of Takasugi Shinsaku. The town is also renowned for Hagi-yaki pottery, a beloved ceramic tradition with over 400 years of history. The Roadside Station Hagi Ōkan (Michi-no-Eki Hagi Ōkan) features a Shōin Memorial Museum and a restaurant serving local Kenran beef.

Yamaguchi City

Known as the "Kyoto of the West," Yamaguchi City features the elegant Rurikōji Temple with its National Treasure five-story pagoda, the historic Ichinozaka River area (famous for firefly viewing in early summer), and the soothing Yuda Onsen hot spring district—perfect for relaxing after a day of walking the Ōkan. The city also has remnants of the highway visible along the Ichinozaka River area.

Hōfu City

The southern terminus offers visits to the Mitajiri Ochaya (Eiunsō), the Mitajiri Ofunakura naval shipyard ruins, Hōfu Tenmangu Shrine (one of Japan's three great Tenjin shrines), and charming historical streetscapes around the Miyaichi area. The haiku poet Santōka's hometown museum is also located along the old highway route.

Best Seasons to Visit

The Hagi Ōkan can be enjoyed throughout the year, with each season offering distinct charms. Spring (late March to May) brings cherry blossoms to the Hagi Ōkan Plum Garden and surrounding areas, along with comfortable walking temperatures. Late May to early June is ideal for viewing fireflies along the Ichinozaka River in Yamaguchi City. Autumn (October to November) is arguably the most spectacular season, when the mountain forests along the route transform into brilliant shades of red and gold, and the annual Hagi Ōkan Marathon event attracts runners from across Japan. Winter offers a quieter experience with fewer visitors, though mountain sections may be cold and occasionally icy.