Corsica is usually sold through blue water, stone villages and long lunches near the sea. The GR20 introduces the island from the inside out.
The trail crosses the mountains that form Corsica’s spine, moving between granite ridges, forests, high lakes and small refuges. The Mediterranean is never very far away, but the landscape often feels more alpine than coastal. One hour can be all warm stone and open sky. The next can bring cloud, wind and a reminder that island weather does not owe you consistency.
The GR20 is often called one of Europe’s hardest long-distance trails. That description is useful only if it stops someone from arriving unprepared. The difficulty is not one dramatic summit. It is the accumulation of steep climbs, rough descents, exposed sections and days when the legs have not recovered from the day before. Some stretches require hands as well as feet. A light pack becomes heavy with repetition.
The northern section has the sharper reputation, but the entire route deserves respect. Refuges are simple, supplies can be limited and plans change with weather, trail conditions and the body carrying the pack. Check the current route and refuge information before leaving rather than treating somebody’s old itinerary as a promise.
Training should look a lot like the trail: long days, uneven ground, climbing and descending with weight. Strong lungs help. Strong feet and patient knees help more. The goal is not to win the GR20. Nobody is handing out medals at the next refuge.
Corsica has easier ways to see a beautiful view. The GR20 matters because it makes you live inside the island for a while, moving slowly enough to understand how much wild country sits behind the beaches.