Namibia
ExpertNaukluft Mountains 4×4 Trail — Büllsport to Tsauchab River Gorge via the Naukluft Plateau High Spine
Dolomite cliff descents with zero room for error.
Surface: Dirt
Australia
DifficultGibb River Road — Beverley Springs to Mitchell Plateau via King Edward River and Kalumburu Road Junction
Mitchell Falls or bust — no rescue coming.
China
DifficultSichuan–Tibet Highway — Batang to Markam via the Jinsha River Canyon and Tibetan Plateau Edge
Drop to the Yangtze, climb into Tibet.
Australia
DifficultGibb River Road — Bell Gorge to Beverley Springs via King Edward River and Barnett River Crossing
The Kimberley's loneliest corrugated stretch.
Nevada
ModerateLonesome Highway — Black Rock Desert Playa to Soldier Meadows via High Rock Canyon Rim
Playa to canyon. Flat to vertical. Nevada at its loneliest.
Australia
DifficultGibb River Road — Silent Grove to Adcock Gorge via King Leopold Ranges and Lennard River
Limestone gorges and corrugations in the Kimberley.
California
ModerateMojave Road Central — Afton Canyon to Piute Spring via Mid Hills and Hole-in-the-Wall
Mojave's volcanic heart — canyon to cliff face.
Ethiopia
ExpertNairobi to Moyale — Northern Kenya Desert Highway via Marsabit and the Chalbi Desert
Kenya's hardest highway — not even close.
Sri Lanka
DifficultRooftop of Sri Lanka — Horton Plains to World’s End via the Central Highlands Plateau
4,000-foot drop at the edge of the world.
USA
ModerateGunsight Pass Road — Wind River Range Wilderness Backdoor via Big Sandy Desert and Lander Cutoff
Oregon Trail grit meets Wind River granite.