We leave L’Ametlla del Vallès in the direction of Santa Eulàlia de Ronçana, cycling along wide tracks between fields and forests of white pine and holm oak. The landscape is open, with the silhouette of the Serra de Collserola already visible on the horizon. As we approach Caldes de Montbui, the terrain becomes more undulating. The town is known for its Roman baths and thermal springs, a living tradition that makes it one of the oldest spa towns in Catalonia. After crossing the old town, we enter Vallès Occidental, passing through Sentmenat and following rural tracks through fields, forests and small villages.