A magnificent crossing on mountain bike suitable only for real athletes. We will cross the gateway to Montseny, the undulating fertile plain which was created by the waters of the L’Alt Ter, torrential and fast flowing due to the different levels of the Pyrenean plains. The erosion of the old riverbed, with its corresponding escarpments and scarps, form a zone totally surrounded by mountains; those of Ripolles and the Garrotxa to the north; The Guilleries to the east; Montseny to the south east; and Lluçanès to the west, and it is enclosed in a circle of mountain ranges with their heights outlined in profile. We will penetrate Montseny Natural Park and the Bertí cliffs. The extraordinary quality of the landscape, the great diversity of the vegetation and the spectacular seasonal changes of colour, especially the chestnut, pine and beech trees, makes it a fitting place to practise mountain biking. We will enjoy an important natural and also historic legacy.