Introduction
The road that carries Tokyo's morning commuters to their offices once carried a shogun's corpse to its shrine — and the asphalt still follows the same path. Japan National Route 122, stretching from Chiyoda Ward in central Tokyo northward through Saitama and Gunma prefectures to the sacred mountain town of Nikkō, is one of Japan's most historically layered highways. It is a road that has never stopped doing what it was built to do: move people between the capital and the mountains, for reasons both sacred and mundane.
Most travelers encounter Route 122 without knowing its name. They cross it near the Imperial Palace, or idle in traffic along it in Kawaguchi, or speed through its tunnels in Gunma's mountains without realizing they are tracing a corridor that predates the city around them by centuries. The road began as a feudal highway — one of the Tokugawa shogunate's five great roads — and its modern incarnation, designated in 1953, simply paved over what was already there.
What makes Route 122 worth paying attention to is not any single landmark but the accumulation of centuries in a single line drawn across the map. Stone mile markers from the Edo period sit within arm's reach of convenience stores. A shrine where guardian lions have been replaced by stone carp watches over an intersection that handles 40,000 vehicles a day. The road connects Tokyo's dense urban core to one of Japan's most revered spiritual sites, and it does so with the casual indifference of infrastructure that has been doing its job for four hundred years.
Drive it end to end — roughly 180 kilometers — and you pass through the full spectrum of Japanese geography: the glass-and-steel canyons of central Tokyo, the flat suburban sprawl of Saitama, and the forested mountain passes of Gunma, where the road threads through tunnels carved into volcanic rock. At the far end waits Nikkō, its cedar avenues and gilded shrines as deliberate a contrast to Tokyo's noise as anything the shoguns could have designed.
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Ashio Copper Mine and the Scarred Mountains
Japan's largest copper mine operated for 363 years, from 1610 to 1973, and what it left behind is more honest than any monument. The approach on Route 122 tells the story before you arrive: hillsides stripped bare by decades of sulfur dioxide emissions, still visibly thin and wounded despite half a century of replanting, standing in sharp contrast to the forested peaks around them. The mine itself is now a museum where visitors ride original ore carts into tunnels cut through raw rock. At the entrance, the temperature drops by as much as 15°C — the air turns cold and iron-scented, dripping sounds echo off stone walls, and you can run your hand along rail tracks worn glass-smooth by a century of loaded carts. This was the site of Japan's first major industrial pollution disaster: in the 1880s, copper runoff poisoned the Watarase River and destroyed farmland across the Kantō Plain, eventually forcing the erasure of an entire village, Yanaka, from the map. Above the museum, on an unmarked hillside reachable by a steep dirt track, collapsed stone foundations of miners' tenement housing sit under moss. Pottery shards still surface in the soil. No signage, no interpretation. The mountain remembers what the brochures prefer to summarize.
Watarase River Gorge
South of Ashio, Route 122 drops into the Watarase Keikoku — a steep river valley where the road narrows, rock walls close in on both sides, and the constant low roar of water over boulders replaces traffic noise entirely. In autumn, roughly mid-October through mid-November, the gorge is considered one of the Kantō region's finest spots for kōyō, when maples and oaks turn the valley walls crimson and amber. But the gorge rewards any season. Spring brings cherry blossoms against grey granite. Summer turns the canopy so dense the road feels subterranean. The Watarase Keikoku Railway, a single-track diesel line built on the old mine ore route, runs parallel to the road — hearing its engine echo off the valley walls before the railcar appears around a bend is one of those small, unrepeatable pleasures that no photograph captures. Pull over at any of the small roadside lay-bys and look carefully: stone jizō statues, knee-high, draped in handmade bibs and knitted caps, stand among the weeds. Local residents placed them to commemorate miners and flood victims. Tangerines, sake cups, and small toys accumulate at their feet, changed with the seasons by hands you'll never see.
The Full Drive: Tokyo to Nikkō's Cedar Avenue
Route 122 is best understood not as a destination but as a 116-kilometer argument that Japan's real drama lives between its famous places. Start in Kita-ku, Tokyo, where the road begins amid dense apartment blocks and vending-machine glow — look down near the Akabane junction for worn granite boundary markers from the Edo-period Nikkō Kaidō, embedded in sidewalk corners at knee height, their kanji faded almost to nothing. Cross into Saitama and the sky opens wide over the Kantō Plain: rice paddies, factory walls, the Tone River bridge where winter's karakaze wind — a dry blast off the northern mountains — can shove a car sideways. Then the mountains arrive. Past Ashio and the Watarase gorge, the road climbs into cryptomeria forest and delivers you to the Cedar Avenue of Nikkō: roughly 37 kilometers of trees planted in the early 1600s by the daimyō Matsudaira Masatsuna to honor Tokugawa Ieyasu. Some trunks measure over 3 meters around — wider than a car is long. The cedars form a living tunnel, their bark deeply furrowed and reddish-brown, cool to the touch even in August, leaving fibrous dust on your fingertips. Sound changes inside the avenue: birdsong amplifies, your footsteps on the needle-carpeted verge go nearly silent. In some sections, three parallel rows of trees are visible — the outer rows planted first as windbreaks for the ceremonial inner row. The spacing shifts subtly, a trace of 17th-century surveyors working by eye across uneven ground. Drive it slowly. Better yet, stop the car and walk.
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In Sōka (草加), Saitama, look for the weathered stone highway markers and surviving matsu-namiki — original Edo-period pines planted to shade daimyō processions. These gnarled trunks and low granite posts are the most tangible remnant of the shogunate's ceremonial road.
Visitor Logistics
Getting There
Route 122 begins in Toshima Ward near Ikebukuro and runs 158 km northeast to Nikkō. By car from central Tokyo, follow Route 122 through Kita Ward and Kawaguchi into Saitama, then Gunma's mountains — expect 3–4 hours to Nikkō without stops. For the scenic Watarase Valley section without a car, take JR Ryōmō Line from Ueno to Kiryū (about 2 hours), then transfer to the Watarase Keikoku Railway.
Opening Hours
Route 122 is a public highway — no hours, no gates, no tickets. Key stops along it keep their own schedules: Ashio Copper Mine is open 9:00–17:00 daily year-round (last entry 16:15), and Michi-no-Eki Kurohone rest stop has 24-hour toilets and parking with its shop open 9:00–17:00. As of 2026, the Tomihiro Art Museum closes December 1 for renovation — verify before visiting.
Time Needed
A nonstop drive from Ikebukuro to Nikkō takes 3–4 hours. The musical road section near Kusaki Lake is a 15-minute detour. A proper road trip with the Ashio Copper Mine, Michi-no-Eki Kurohone, and Kusaki Lake viewpoints fills a full day (8–10 hours). Two days lets you add the Watarase Keikoku trolley train, which alone is a half-day commitment.
Cost & Tickets
The road itself is toll-free — that's partly why truckers love it. As of 2026, Ashio Copper Mine charges ¥830 for adults and ¥410 for children; disability card holders enter free. The Watarase Keikoku trolley train adds a ¥520 surcharge on top of regular rail fare, or grab the ¥1,880 one-day pass if you plan to hop on and off.
Accessibility
Ashio Copper Mine requires a 300-meter walk on uneven terrain inside the tunnel after a trolley ride with steps — wheelchair access is limited, so call ahead at 0288-93-3240. Michi-no-Eki Kurohone has one accessible parking space and a 24-hour accessible toilet. The Watarase Keikoku trolley cars are open-air with steps and no wheelchair boarding provisions.
Tips for Visitors
Drive the Musical Road
Between Michi-no-Eki Kurohone and Kusaki Lake, grooves in the asphalt play "Usagi to Kame" (The Tortoise and the Hare) when you drive at the posted speed limit. Roll your windows up and resist the urge to speed — go too fast and the melody warps into nonsense.
Morning Drinks in Akabane
Near the route's southern end, Akabane's Ichi-ban-gai arcade has standing bars open from 8am — not a tourist gimmick but a genuine tradition among night-shift workers and retirees. Maruken Suisan serves oden and cheap sake for ¥200–500 per item; it's the kind of place where nobody asks why you're drinking before noon.
Time Your Season
Autumn (October–November) turns the Watarase Valley into a corridor of red and gold, and it's the peak reason to drive this route. Winter brings real hazard: the mountain sections near Ashio ice over, the trolley train stops running, and the Tōhoku Expressway becomes the smarter choice.
Sōka Senbei Detour
In Sōka, Saitama — early in the route heading north — a restored stretch of the original Nikkō Kaidō still has Edo-era pine trees and stone markers. The town has made rice crackers (senbei) since the feudal period. Buy them fresh from roadside shops; they're crunchier and less sweet than the packaged versions sold in Tokyo stations.
Bring a Layer Underground
The Ashio Copper Mine interior stays cool and damp year-round, even when Gunma's summer heat hits 35°C outside. A light jacket saves you from 90 minutes of shivering through the tunnel exhibits. Sturdy shoes matter too — the 300-meter walking section is uneven and occasionally wet.
Skip the Nikkō Tourist Trap
Souvenir shops near Tōshō-gū at the route's northern end inflate prices aggressively. For yuba (tofu skin) — Nikkō's signature food — buy from shops a few streets back from the shrine approach where locals actually shop, often at half the price.
Where to Eat
Don't Leave Without Trying
Kumar Dhaba
local favoriteOrder: The butter chicken curry and house-made naan are exceptional—this is where locals line up for authentic North Indian comfort food, not tourist-trap curry.
A genuine neighborhood gem where the owner knows regulars by name. 117 reviews with a 4.7 rating means this place is doing something real, not playing it safe for visitors.
Kushikatsu Tanaka nishisugamo
local favoriteOrder: The mixed kushikatsu platter—crispy-fried skewers of pork, shrimp, and vegetables dipped in tangy sauce. It's Tokyo comfort food at its most honest.
A proper chain done right: 663 reviews, consistently packed, and the kind of place where salarymen unwind after work. Affordable, no pretense, pure satisfaction.
てんびん
local favoriteOrder: The seasonal set lunch and grilled fish—this is the kind of place where the menu changes with what's fresh, not what's profitable.
197 reviews, solid 4.4 rating, and it's been a neighborhood staple long enough that locals trust it completely. No Instagram theatrics, just excellent traditional Japanese cooking.
西巣鴨 YaoyaBal
local favoriteOrder: Whatever vegetables are in season, grilled or as part of the daily specials—the name 'Yaoya' means greengrocer, so produce is the star here.
A tight, intimate spot on the second floor where locals gather for drinks and honest food. Limited hours mean it's not trying to be everything to everyone—it's exactly what its neighborhood needs.
Dining Tips
- check Tokyo restaurants near Route 122 are concentrated in residential neighborhoods like Nishisugamo and Takinogawa—these are where locals actually eat, not tourist zones.
- check Many smaller establishments close on Mondays or have limited evening hours; always check ahead before making the trip.
- check B-kyu Gurume (B-grade gourmet) spots offer the best value: excellent quality at casual prices, no reservations needed.
- check Cash is still king at neighborhood joints; bring yen and don't assume card payment is available.
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Historical Context
The Road That Refused to Move
Roads die all the time. They get bypassed, rerouted, buried under shopping malls. Route 122 has survived because its purpose — connecting the seat of power to the seat of the sacred — has never become obsolete. When Tokugawa Ieyasu ordered road improvements in 1601, the corridor linking Edo to the northern mountains was already well-trodden. When his grandson Iemitsu formalized the sankin-kōtai system in 1635, forcing feudal lords to march to Edo every other year with their entire households, this road became one of the most heavily trafficked arteries in Japan. And when the automobile arrived three centuries later, engineers simply widened what was already there.
The route follows — and at times overlaps with — two distinct Edo-period highways: the Nikkō Kaidō, the main ceremonial road, and the Nikkō Onari Kaidō, a parallel route reserved exclusively for the shogun's personal pilgrimages. That distinction has been lost to asphalt, but the function endures. People still travel this corridor to reach Nikkō's shrines. They just do it at 80 kilometers per hour instead of on foot.
Iemitsu's Obsession and the Road It Built
Tokugawa Iemitsu, the third shogun, was consumed by the memory of his grandfather Ieyasu. When Ieyasu died in 1616, his remains were initially interred at Kunōzan in Shizuoka. But Iemitsu — who had worshipped his grandfather since childhood and reportedly wept at the mere mention of his name — orchestrated the transfer of Ieyasu's spirit to the newly built Tōshō-gū at Nikkō in 1617. His father Hidetada oversaw the construction, but it was Iemitsu who, upon becoming shogun, transformed the modest shrine into the extravagant, gold-leafed complex that survives today.
For Iemitsu, the road to Nikkō was not infrastructure. It was devotion made physical. He poured resources into maintaining the highway, mandating that the cedar trees lining the approach be preserved — a directive that created the famous Nikkō Cedar Avenue, now a UNESCO World Heritage site stretching longer than a half-marathon course. The sankin-kōtai system he established in 1635 guaranteed that the road would never fall into disrepair: hundreds of daimyō processions, some numbering over a thousand retainers, marched along it every year.
The turning point came with Iemitsu's own death in 1651. He was buried at Nikkō beside his grandfather, cementing the road's status as a corridor of the dead as much as the living. After that, no shogun could neglect the highway without appearing to neglect the founding dynasty itself. The road's survival was no longer a matter of engineering. It was political theology.
What Changed: Asphalt Over Cedar Roots
The physical road is unrecognizable. Elevated bypasses now carry traffic over sections that once wound between post stations where travelers slept on tatami mats and ate soba noodles. The checkpoints — where Edo-period officials inspected travelers for smuggled weapons and fleeing women — are gone, replaced by traffic lights. In Gunma Prefecture, tunnels bore through mountains that Edo-period travelers had to climb over on foot. The road's width has tripled in places, and its surface has gone from packed earth to concrete to asphalt. Most of the ichirizuka, the earthen mile markers placed every 3.9 kilometers, have been bulldozed for road widening. The few that survive sit on traffic islands, overlooked by everyone.
What Endured: The Line on the Map
And yet the route itself — the actual line it draws across the Japanese landscape — has barely shifted. Route 122 still begins in Chiyoda, near the Imperial Palace that replaced Edo Castle, and still ends at Nikkō, where Ieyasu's shrine still receives millions of visitors a year. The corridor passes through the same river valleys, the same mountain gaps, the same flatlands north of Tokyo. Pilgrims still travel it, though they now arrive by car and tour bus rather than on foot. Even the road's dual identity persists: it remains both a commuter artery for Saitama's suburbs and a spiritual corridor to one of Japan's holiest sites. Four centuries have changed everything about the road except its reason for existing.
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Frequently Asked
Is Japan National Route 122 worth visiting? add
Yes, but think of it as a corridor, not a destination — the value is in the stops along its roughly 158 km from Tokyo to Nikkō. The Ashio Copper Mine museum lets you ride an original ore cart into Meiji-era tunnels, the Watarase Gorge turns crimson in October, and a stretch of road near Kiryu literally plays music when you drive over it at the speed limit. Skip the urban Saitama flatlands unless you're into pachinko parlors and industrial scenery.
How long do you need to drive Japan National Route 122 from Tokyo to Nikko? add
The straight drive takes 3–4 hours without stops, but a full day (8–10 hours) is realistic if you want to actually see anything. The Ashio Copper Mine alone needs 90 minutes, the musical road section near Kusaki Lake takes 15–30 minutes, and the Watarase Keikoku Railway trolley is a half-day commitment if you ride it round-trip. Two days lets you linger in the gorge and arrive in Nikkō unhurried.
How do I get to Route 122 from central Tokyo? add
Route 122 starts in Toshima Ward near Ikebukuro, so you're already on it if you're driving north from central Tokyo. By car, pick it up heading northeast through Kita Ward toward Kawaguchi in Saitama. If you don't have a car, the Watarase Keikoku Railway from Kiryu Station (reachable from Ueno via JR Ryomo Line in about 2 hours) parallels the scenic mountain section — which is the only part worth going out of your way for.
What is the best time to visit Route 122 and the Watarase Valley? add
Mid-October to mid-November, when autumn foliage fills the Watarase Gorge with crimson and gold — this is one of the Kantō region's best koyo corridors. Spring (April–May) brings cherry blossoms and the start of the trolley train season. Avoid December through March for the mountain sections: snow and ice cover the road above Ashio, the trolley train doesn't run, and the fierce karakaze wind off the mountains can literally push your car sideways on the Tone River bridge.
Can you visit Japan National Route 122 for free? add
The road itself is a public highway with no tolls, and the musical road section near Kurohone costs nothing — just drive at the speed limit with your windows up and listen to "Usagi to Kame" play through your tires. The Ashio Copper Mine museum charges ¥830 for adults (¥410 for children), and the Watarase Keikoku Railway trolley adds a ¥520 surcharge on top of regular fares. Michi-no-Eki Kurohone rest stop is free, with 24-hour toilets and parking.
What should I not miss on Route 122 between Tokyo and Nikko? add
The Ashio Copper Mine is the standout — the temperature drops 10–15°C at the tunnel mouth, the air smells of iron and mineral water, and you can touch ore-cart rails worn glassy-smooth by a century of use. Don't skip the denuded hillsides on the approach to Ashio: sulfur dioxide emissions stripped these mountains bare over a hundred years ago, and even after decades of replanting they look scarred against the surrounding forest. The musical road near Kusaki Lake is a genuine oddity, and the Nikkō Cedar Avenue at the route's end — 400-year-old cryptomeria trees forming a cathedral tunnel roughly 37 km long — is the kind of thing that makes you pull over and just stand there.
Is there a musical road on Route 122 in Japan? add
Yes — between Michi-no-Eki Kurohone and Kusaki Lake in Gunma Prefecture, grooves cut into the asphalt play the children's song "Usagi to Kame" (The Tortoise and the Hare) when you drive at the posted speed limit. Keep your windows closed for the clearest sound. Drive too fast and the melody distorts into an unrecognizable whine, which is either a safety incentive or a music-criticism tool, depending on your perspective.
What is the history of Route 122 and the Nikko Kaido? add
Route 122 follows the path of the Nikkō Kaidō and the Nikkō Onari Kaidō, Edo-period highways built to connect the shogun's capital with Tokugawa Ieyasu's mausoleum at Nikkō. The road was formalized around 1636 as part of the Gokaidō system, and the sankin-kōtai policy of 1635 — requiring feudal lords to march to Edo every other year — kept it maintained to military-grade standards. The modern highway was designated in 1953, paving over most of the original route, though fragments survive: stone mile markers in Tokyo's Kita Ward, the restored pine avenue in Sōka, and the cedar-lined approach to Nikkō itself.
Sources
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Japan National Route 122 — Wikipedia (English)
Route overview, terminus points, general alignment and length
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国道122号 — Wikipedia (Japanese)
Detailed route information, musical road section, rest stops along the route
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Ashio Copper Mine — Visit Nikko Official
Ashio Copper Mine museum hours, access, and visitor experience details
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verified
Ashio Copper Mine — JNTO Japan's Local Treasures
Historical context and visitor information for the mine
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Ashio Copper Mine — Jalan.net
Current ticket prices, hours, and disability access details
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verified
Watarase Keikoku Railway — GOOD LUCK TRIP
Trolley train schedule, pricing, booking information
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verified
Watarase Keikoku Railway — Visit Tochigi
Seasonal operation details and access from Tokyo
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verified
Tomihiro Art Museum — Midori City Official
Museum hours, ticket prices, and 2026 renovation closure notice
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verified
Michi-no-Eki Kurohone Yamabiko — Kanto Michi-no-Eki Official Directory
Rest stop facilities, parking capacity, restaurant hours
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verified
Musical Road (Melody Line) — Gunlabo
Location and description of the musical road section on Route 122
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verified
Kuki City Official Archives — Nikkō Kaidō History
Ichirizuka mile markers, Edo-period highway construction dates, Five Highways Map references
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verified
Japan Experience — Nikkō Kaidō and Sankin-Kōtai
Tokugawa road improvements (1601), sankin-kōtai system establishment (1635)
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verified
Nikko Ashio Itinerary — Visit Nikko Official
Bus access from Nikko Station to Ashio Copper Mine, travel times
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verified
AARoads Wiki — Japan National Route 122
Route designation history and alignment details
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verified
Ameblo — Oku no Futomichi 1689 (Nikkō Kaidō walking blog)
Legends along the route including Aizu fox guide story, Hōroku Jizō execution ground, and roadside jizō statues
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