Iceland's greatest walk runs 55 kilometres from the steaming rhyolite hills of Landmannalaugar — mountains in shades of mustard, rust and mint — to the birch valley of Þórsmörk, past obsidian fields, black deserts and a couple of bracing river wades. Four days hut-to-hut is the standard; the huts book out by midwinter, so plan early or join a guided group. The season is short and sweet: mid-July to early September. Start with a soak in Landmannalaugar's natural hot spring.
Featured in Ten treks for your first big summit or base camp · Adventure