The beautiful forests of the Bisaurri municipality are an ideal scenery for the first Puro Pirineo route. After a short asphalt section from Bisaurri, the descend from Gabás to El Run is a sort of perfect one for enduro lovers, with almost 3 km of singletrack in a wild enviroment. From El Run to Castejón and later to Arasán the itinerary climbs up using dirt and local roads. Finally two long singletrack sections connect the villages of Arasán, Urmella and Bisaurri through some nice forests, leading into the main road N-260 which must be crossed carefully.