The Cicerone Guide to the GR10 Trail details walking across the Pyrenees from Atlantic to Mediterranean. Taking 50 days to complete & divided here into sections tackled in a fortnight's holiday, with details of accommodation & transport. The GR10 is one of a number of official long-distance paths (Grandes Randonnées) in France. Ideal for early June through to the end of September, although care should be taken over high passes early in season. High season July & August.