GR20 is a long-distance route located on the island of Corsica (France), in the middle of the Mediterranean. The recommended route takes us from Conca in the south-east of the island to Calenzana in the north-west. The route is perfectly signposted with the marks of the long distance paths, two stripes, one white and the other red. Along the route there are mountain refuges guarded that offer anything necessary but due to the massive influx in the summer months it is necessary to make a reservation. The path, despite being situated on a Mediterranean island, runs through surprising alpine landscapes creating a magical mixture.