A guidebook to hiking the 850km (520 mile) GR11 (La Senda Pirenaica) trail between Irun on the Atlantic coast and Cap de Creus on the Mediterranean. Over the years it has become a well-defined hiking trail which mostly goes over good hiking paths through largely unspoilt and wild mountains and is suitable for experienced mountain hikers. The GR11 is one of the long-distance trails which crosses the whole Pyrenees, staying on the Spanish side of the border. It is presented here in 47 stages of 7-31km (5-19 miles), four sections are given to allow the route to be broken into shorter treks. Step-by-step route description and 1:100,000 mapping provided for each stage Highlights include Navarre, Ordesa, Monte Perdido, Valles Occidentales, Posets-Maladeta, Parc Natural Alt Pirineu Route Summary Table and Stage Facilities Planner to help plan itineraries Detailed information on planning, local flora and fauna and accommodation GPX files available to download