Oklahoma
ModerateOuachita National Recreation Trail
Ridge-running backbone through the Ouachitas
Trail Type: Overland Route
Iceland
ModerateReykjanes Peninsula Geothermal Circuit F427
Volcanic moonscape between tectonic plates
Iceland
ModerateKjölur Highland Route F35 Northern Extension
Highland solitude beyond the tourist buses.
Iceland
ModerateEldgjá F208 Fire Fissure Highland Traverse
Follow the 40km scar of Iceland's biggest eruption.
Iceland
DifficultVatnsdalur F578 Glacier Valley Traverse
Isolated glacial valley with abandoned settlements
Iceland
ModerateHveravellir Highland Traverse F35
Highland crossing between glaciers with hot springs
Iceland
ModerateKjalvegur F35 Highland Traverse
NASA moonscape through glacial river crossings
Iceland
ModerateFjallabak Nature Reserve Southern Route F208
Rainbow mountains and volcanic fissure traverse
Iceland
ModerateKaldidalur Highland Track
Medieval glacier pass between Langjökull and Ok
Iceland
DifficultAskja Caldera Volcanic Desert Crossing
NASA astronaut training ground to active caldera