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https://carrerasdemontana.com/2015/02/23/trail-running-madrid-rutas-vuelta-a-la-sierra-de-hoyo-44kd825m-trail-pistero-por-cerceda-moralzarzal-la-berzosa-hoyo-manzanares/
TRAIL RUNNING MADRID, RUTAS: VUELTA A LA SIERRA DE HOYO. (44k/D+825m) Trail pistero por Cerceda - Moralzarzal - La Berzosa - Hoyo - Manzanares