GR20

The GR20 is a long-distance hiking trail on the French island of Corsica and part of the Grande Randonnée network. Established in the 1970s and maintained by local associations, it is widely regarded as one of Europe’s toughest long-distance trails. The route runs roughly north to south across Corsica’s central mountains, from Calenzana in the Balagne region to Conca in the south, covering about 180 kilometers (112 miles).

The trail traverses granite ridges, scree slopes, alpine meadows and forested valleys, with several high passes and exposed sections. The central Corsican massif contains the most rugged terrain, and hikers encounter sustained elevation gain across many days, including some scrambling and rocky ledges that may require fixed ropes. The route is commonly divided into a northern and a southern half, which can be tackled as separate sections.

Accommodation along the GR20 consists of mountain refuges (gîtes) and some campsites, with huts filling quickly in peak season. Many hikers plan 14 to 16 days for the full trek and reserve stays in advance. Water availability and shelter options vary by season, and some segments offer limited facilities.

Practical considerations include the trail’s physical demands and weather dependence. Best conditions are typically late spring to early autumn; winter conditions can block high passes with snow and ice. Hikers should be prepared for rapidly changing weather, carry proper navigation tools, wear sturdy footwear, and be comfortable with scrambling and steep ascents.