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https://carrerasdemontana.com/2012/03/18/rutas-sierra-madrid-integral-crestas-pto-navacerrada-pto-leon-cercedilla-30kdt3-000m4-6h/
Rutas Cercedilla: La Cresta del León > Pto.Navacerrada - Pto.León - Cercedilla (30k/DT3.000m/4-6h)