Iceland's most popular hiking trail goes from Landmannalaugar to Þórsmörk, covering more than 55km of breathtakingly beautiful and varied landscapes. The classic itinerary is tackled over four stages, generally interspersed with nights sleeping in a tent. On the agenda: lava fields, valleys, canyons, river crossings, strange rock formations... Don't hesitate to enlist the services of a guide, and it goes without saying that safety instructions and environment-preservation guidelines should be followed.