The Fundación de los Ferrocarriles Españoless (Spanish Railways Foundation) has organised its "Green Routes" programme with the aim of converting Spain's 7,000 km of disused railway lines into routes for cycle tourists and hikers. The"Green Route to the Vall Fosca (Dark Valley)" passes through the district of El Pallars Jussà in Lleida (Spain) province and close to the Aigüestortes i Estany de Sant Maurici National Park.