The basins of the rivers Pas, Pisueña (Carriedo) and Miera are always green and perfectly fit the most spread stereotype regarding Cantabria: intricate valleys, pastures that fade away behind the hillocks in the mountains and people of reserved nature. These three contiguous valleys, until recently not interconnected by road—nowadays, driving around is not a problem, except when there are heavy snowfalls in winter—have long been connected via mountain passes of the same mountains that divide them, due to the transhumance practiced by their people, the “pasiegos”. The most important villages are Liérganes—whose older part has been listed as a historic-artistic ensemble, Villacarriedo and Selaya.