“There is no doubt that the GR20, traversing the rugged mountains of Corsica, is one of the top trails of the world. Its reputation precedes it, and most walkers who trek the route describe it afterwards as one of the toughest they have ever completed. Others find they are unable to complete it, having seriously underestimated its nature. The GR20 climbs high into the mountains and stays there for days on end, leading ordinary walkers deep into the sort of terrain usually visited only by mountaineers. The scenery is awe-inspiring, with bare rock and vertical lines in some parts, contrasting with forests, lakes and alpine pastures in other places. Those”