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Corsica's GR20 carves 180km along the island's razor-sharp granite spine from Calenzana to Conca, delivering raw alpine drama on a Mediterranean isle. Jagged peaks, pine-shrouded valleys, and hidden lakes eclipse mainland Europe's trails with untamed solitude. No crowds clog this path; instead, find crystalline streams and 2,600m summits that test every muscle.
Core stages climb exposed ridges like Bocca Piccaia, ford rivers via chain-assisted ladders, and skirt glacial cirques at Melo and Capitello. Side quests hit Monte Cinto or swim emerald pools after brutal ascents. Refuges dot the route every 5–8 hours, blending hut-to-hut rhythm with wild camping options.
Late May to mid-October offers snow-free passage, peaking June–September with long days but heat; shoulder months bring solitude yet weather risks. Expect loose scree, 1,000m+ daily gains, and sudden storms—train for 8–16 day thru-hikes. Water sources abound but purify; resupply at midpoints like Vizzavona.
Corsican bergeries serve charcuterie and local brocciu cheese, fueling trekkers amid sheep bells and wild boar sightings. PNRC rangers enforce strict leave-no-trace ethics, preserving this fra li monti ("through the mountains") heritage. Join guided groups for insider trailside lore from locals who view the GR20 as sacred island backbone.
Book refuge beds months ahead through the Parc Naturel Régional de Corse website, as capacity fills fast in peak summer. Start from Calenzana north-to-south for the classic flow, tackling rugged north first while fresh; allow 10–16 days based on fitness. Check snow conditions via PNRC updates, as late starts risk delays.
Train with loaded backpack hikes on technical terrain to build endurance for 12,000m total gain. Pack light but prioritize water purification, as streams vary; refuges offer basic meals but carry snacks. Download offline maps like IGN 1:25,000, since cell signal vanishes.