Length is the simplest measure of a trail and the one most beginners ignore. Difficulty gets the attention. Photos sell trips. Length quietly decides whether something is a weekend or a season.
The shortest entry on this list could be driven in a week by a confident wheeler. The longest is closer to a sabbatical. They share one thing: each is a single named route, drivable end-to-end, recognized as a route in its own right. Not a regional network. Not a “you could spend a month bouncing through Idaho.” A route.
Here are nine of the longest such routes in our atlas, ordered shortest to longest so the scale lands as you read.
What counts
A few ground rules before the list, because the question “what’s the longest overland route in the world?” has more wrong answers than right ones.
We’re looking at single, named overland routes — not networks of trails, not road trips you string together by stitching paved highways between dirt sections, and not coast-to-coast claims that rely on someone’s specific path. The Pan-American Highway, for example, is mostly paved and isn’t on this list. The Continental Divide route in the US is a network rather than a single named route, so it’s not here either.
What you’ll find below is mostly dirt, mostly remote, and mostly drivable by a stock 4×4 if you’ve prepared properly. A few are infamous. A few will surprise you. All of them are commitments — measured not in weekends but in weeks and months.
9. Magadan Highway (Kolyma Highway M56)
1,262 miles · 7-10 days · June-August
Stalin’s frozen highway where trucks go to die. The Kolyma Highway runs from Yakutsk to Magadan through the Russian Far East, and there’s a reason it goes by the nickname Road of Bones: a portion of the roadbed was built using the bones of gulag prisoners who didn’t survive its construction in the 1930s.
The road today is paved in fits and starts, mud and ice for the long sections in between. Fuel stops can be 200+ miles apart. The cell towers run out fast. The route is mostly drivable in summer (June through August), when the permafrost holds; in winter, it becomes an ice road and a different category of expedition entirely. Most who attempt it run heavy-duty 4WD with serious recovery gear and at least one redundant fuel system.
Read the full Magadan Highway entry →
8. Alaskan Highway
1,500 miles · 7-10 days · May-September
The mother of all road trips to the Last Frontier. Built in eight months during WWII as a wartime supply route, the Alaskan Highway runs from Dawson Creek, BC, to Delta Junction, Alaska — through some of the most remote wilderness left on the continent.
What makes this entry different from the rest of this list: most of it is now paved. Modern travelers can drive it in a Civic. But that doesn’t make it tame — services thin out for hundreds of miles at a stretch, weather flips fast, and the wildlife shows up in the road in ways that change your insurance situation. The Alcan earns its spot here on length and history; the experience itself is more “long road trip” than “remote expedition.” For wheelers, it’s the gateway to everything that branches off it.
Read the full Alaskan Highway entry →
7. Baja Divide Route
1,700 miles · 7-10 days · December-April
The granddaddy of Baja peninsula traverses. The Baja Divide cuts straight through the heart of the peninsula, from Tijuana down to Cabo, mostly on dirt and gravel ranch roads, washes, and old mining tracks.
What makes this one stand out is access: it starts at the US border. You can roll out of San Diego, cross at Tecate, and be on dirt within two hours. No flights. No paperwork beyond your passport and a tourist permit. The terrain is desert, mountains, and stretches of Pacific coast you don’t see from Highway 1. Winter is the season — summer in Baja’s interior is brutal and water sources dry up. High-clearance 4WD is the minimum; the route was originally designed for bikepacking, so most of it is wide enough for a vehicle but expects rough going.
Read the full Baja Divide entry →
6. Backcountry Discovery Route — California (CABDR)
1,700 miles · 14-21 days · April-October
Border-to-border California backcountry odyssey. The California BDR is one of the more polished entries in the BDR series — a 1,700-mile route from the Mexican border to Oregon, traversing the spine of California through national forests, BLM land, and high desert.
Compared to its northern and Pacific Northwest counterparts, the CABDR runs through more varied terrain than almost any single route in the country: Sonoran desert at the south end, Sierra granite in the middle, redwood country and high lava plateau in the north. Most riders do it in two to three weeks. April through October is the window; the high Sierra portions hold snow well into June, and the desert south is brutal in July-August. High-clearance 4WD is required for most of it.
Read the full California BDR entry →
5. Trans-Siberian Taiga Backroad (R255)
1,988 miles · 10-14 days · June-August
3,200 km taiga crossing parallel to the Trans-Siberian. The R255 runs as an unofficial parallel to the Trans-Siberian Railway through the heart of Siberia — Novosibirsk to Khabarovsk, give or take, mostly through endless taiga forest with rivers and bogs to break the monotony.
It’s not a single ribbon of highway. It’s a network of regional roads, forest tracks, and the gaps between them stitched together by determined travelers. Summer (June through August) is the only viable window; the rest of the year, snow and mud make it functionally impassable for most vehicles. Modified 4WD with high clearance is the minimum, and even then, expect to winch out of bogs and ford rivers without bridges. This is one of those routes where the idea of it appeals to a lot more people than the execution of it.
Read the full Trans-Siberian Taiga Backroad entry →
4. Oregon Backcountry Discovery Route
2,000 miles · 12-21 days · June-October
Oregon’s ultimate backcountry adventure. The ORBDR runs from Jordan Valley on the Idaho border to Bonneville Dam on the Columbia River — 2,000 miles through the high desert, ponderosa forests, Cascade volcanic country, and the western foothills. Like the rest of the BDR series, it was originally designed for adventure motorcycles but works well for high-clearance 4WD.
Oregon’s geography means this route packs more variety per mile than most BDRs. You start in scrub desert, climb into ponderosa pine, cross volcanic plateau, then drop into Pacific Northwest rainforest. Snow shuts down the high passes from late October through May, so summer is the window. The route is generally well-marked and doesn’t have any single section that’s punishing — it’s more about endurance than difficulty.
Read the full Oregon BDR entry →
3. Trans-Sahara Highway Central Route
2,796 miles · 2-3 weeks · December-February
The classic trans-African adventure. The Trans-Sahara Highway runs from Algiers down through the heart of the Sahara to Lagos, Nigeria — connecting the Mediterranean to the Gulf of Guinea through some of the most isolated terrain on Earth.
Long stretches are paved in name only. The desert wears asphalt down to nothing within a few seasons, and even where the road technically exists, drifting sand erases it. Fuel stops can be 400+ miles apart. December through February is the only sane window — summer temperatures kill engines and people. The geopolitical situation makes this route a moving target; sections close periodically when borders or security shift. Stock 4WD is the minimum, but most who do it run extra fuel tanks, water capacity, and serious recovery gear.
Read the full Trans-Sahara Highway entry →
2. Trans-America Trail
5,000 miles · 3-6 weeks · May-September
America’s ultimate coast-to-coast dirt adventure. The TAT is Sam Correro’s masterpiece — a 5,000-mile route from Cape Fear, North Carolina, to the Pacific in Oregon, almost entirely on dirt roads, forest service tracks, and old logging routes. Most riders take three to six weeks.
The TAT is what happens when one person spends decades stitching together every drivable backroad between the Atlantic and Pacific. It’s accessible — stock 4WD or even an adventure motorcycle will do it — but the length is the challenge. Three weeks of camping. Three weeks of weather. Three weeks of finding fuel and resupply in towns that often have one gas pump and a general store. The route’s character changes radically every few states: Appalachian hollers, Mississippi delta, Oklahoma plains, New Mexico high desert, Rocky Mountain passes, Oregon high desert, Pacific rainforest. By far the most accessible entry on this list — and one of the most rewarding.
Read the full Trans-America Trail entry →
1. Cape to Cairo Trans-Africa Highway
6,214 miles · 2-3 months · April-September
Africa’s ultimate overland odyssey. The Cape to Cairo route is exactly what it sounds like: 10,000 km from the southern tip of Africa to the Mediterranean coast of Egypt. Cecil Rhodes dreamed it up in the 1890s as a British rail and road corridor; it never quite came together as he envisioned, but the overland route exists today, threaded together through ten countries.
This isn’t a route. This is a journey. Three months on the road minimum, often four or five. You’ll cross deserts, savanna, mountain passes, and rainforests. You’ll deal with border crossings in countries where the customs officer hasn’t seen a foreign overlander in months. You’ll need carnets, visas, vaccinations, and a vehicle prepared for everything from -10°C in the Drakensberg to 50°C in the Sahara. Expedition-ready 4WD is the bare minimum, and most who attempt it run with a partner vehicle for redundancy. April through September is the most commonly recommended window, threading the rainy seasons in the various climate zones.
What makes this route the longest on our list and also the most ambitious is what it isn’t: it isn’t a vacation. It’s a chapter of someone’s life.
Read the full Cape to Cairo Trans-Africa Highway entry →
What’s not on this list (and why)
A few obvious omissions worth addressing:
The Pan-American Highway is mostly paved. It’s a remarkable journey but not an overland route in the dirt-and-remote sense. Anyone driving it spends 90% of their time on regular highways.
The Continental Divide Trail (US) is a hiking and cycling route, not a vehicle one. Its rough vehicle analogue — the Great Divide Mountain Bike Route — is on our atlas but isn’t a single named route in the way the BDRs are.
The Karakoram Highway, the Stuart Highway, Ruta 40, the Dalton Highway — all are partly or mostly paved, putting them in the same category as the Alaskan Highway: a long drive, but not a long overland route. (The Alaskan Highway makes the list largely on history; the others would too, but they don’t meet our length bar.)
Australian outback routes (the Canning Stock Route, the Anne Beadell Highway, the Gunbarrel) are some of the most legendary overland challenges on Earth. They’re not on our atlas yet, but several deserve to be.
This list will change as the atlas grows. We’re adding about 100 trails and destinations a week. The thresholds keep getting higher. If a route you think should be on this list isn’t, you can suggest it through the atlas — or hold onto your nomination and check back in three months.
What this list is really for
These routes aren’t bucket-list items in the sense most travel writing means. They aren’t a checklist. They aren’t an Instagram tour. Each of them takes you outside — outside cell service, outside support networks, outside the everyday certainty that someone will come help if something breaks.
Most wheelers will never do any of them. That’s fine. The point isn’t to drive these roads. The point is to know they exist — to know that somewhere out there, right now, someone is on day 47 of crossing Africa or week 3 of the TAT or somewhere on the Kolyma Highway watching for elk in their headlights at midnight. The road is bigger than you think. The list reminds you of that.
If you want to plan something that’s a step up from a weekend trip, browse the atlas and filter by duration. There are dozens of multi-day routes that won’t take three months but will scratch the same itch.
The pavement ends. The world keeps going.
