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The GR20 stands as Europe's toughest long-distance trek, slicing 180km across Corsica's granite spine from Calenzana to Conca over 12-16 grueling days. Its jagged peaks, sheer drops, and minimal infrastructure set it apart from gentler paths like the Tour du Mont Blanc, demanding via ferrata skills, endurance, and self-reliance. Wild beauty unfolds in unspoiled maquis scrub, glacial cirques, and endemic flora, far from mass tourism.
Core experiences span the northern Cirque de la Solitude's exposed scrambles, Vizzavona's forested pass linking trail halves, and southern Piscia di Ghjadistu's waterfall cascades. Detours to Monte Cinto or needle-like pinnacles add summits amid 2,000m+ cols. Daily 1,500m elevation changes mix aerobic climbs with technical descents on loose scree.
Prime June-September brings stable weather, though thunder showers strike afternoons; May and October risk snow or mud. Expect 10-15°C averages with 40% humidity, plus mosquitoes in wetlands. Prepare via multi-day training hikes, fitness base, and refuge reservations to navigate 16,000m total ascent.
Corsican bergeries dot the route, offering goat cheese and brocciu encounters with shepherds upholding pastoral traditions amid independence sentiments. Trekkers bond in refuges over pastis, sharing tales of the island's resistance spirit. Locals view the GR20 as sacred, a rite reinforcing rugged identity.
Plan for 12-16 days to complete the full 180km north-to-south route, booking refuges or bivouac spots months ahead via the Parc Naturel Régional de Corse website as they fill fast. Start from Calenzana in June-September to dodge spring snow and autumn storms; train with loaded 15km hikes including elevation gain. Consider guided options for novices, but self-supported treks build the raw adventure.
Acclimatize upon arrival with day hikes, as daily gains exceed 1,000m amid variable weather. Pack for extremes: mornings dip to 5°C even in summer, afternoons hit 30°C. Secure water from fountains but carry purification; refuges provide meals, freeing pack weight for essentials only.