The GR20: Europe's Hardest Long-Distance Trail
The GR20 is widely regarded as the toughest long-distance hiking trail in Europe — 180 km of granite scrambling across the mountainous spine of Corsica, with relentless ascent and descent on boulder-strewn, sometimes exposed terrain.
It is not a gentle walk. The northern half in particular involves hands-on scrambling and route-finding over slabs. The reward is some of the wildest mountain scenery in the Mediterranean.
The Two Halves
The northern half (Calenzana to Vizzavona, ~100 km, 7–9 days) is the harder, more spectacular section with granite cirques and exposed scrambling. The southern half (Vizzavona to Conca, ~80 km, 5–6 days) is lower, forested and gentler. Vizzavona, the midpoint, is accessible by the island's railway.
PNRC refuges are spaced roughly a day apart and must be booked in advance for July–August. Camping is limited to designated areas near each refuge.
Frequently asked questions
- How long is the GR20? Approximately 180 km over 12–15 days from Conca to Calenzana, with about 10,000 m of cumulative ascent. It is considered the hardest long-distance trail in Europe.
- When is the best time for the GR20? June to September. Snow blocks the high sections until late June; September is quieter and often ideal. Refuges close by October.
- Is the GR20 dangerous? It involves sustained scrambling and exposed terrain, especially in the northern half. It demands a head for heights, good fitness and mountain experience. Check current conditions — sections have been rerouted after rockfall.
- Can I walk only part of the GR20? Yes. Many walkers split the trail or walk only one half. Vizzavona is the midpoint and is accessible by the island's railway, making it the natural start or end point for a half-traversal. The northern half is the harder, more spectacular section.
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