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https://carrerasdemontana.com/2017/08/19/siete-picos-canal-de-la-x-ruta-sierra-de-guadarrama-10kd840ii-guia-completa-con-video-track-gps-y-fotos/
Rutas Cercedilla: Siete Picos, Canal de la X (10k/D+840/II) Guía completa con video, track gps y fotos