Asón und Agüera is the Cantabrian region between the Basque Country and Burgos that ends with Cantabria at the East. The valleys belonging to this area are without any doubt the green among the green. Forests of beeches, oaks and holm oaks flood the entire region on a limestone rock base. Routes with smooth relief, rivers and streams that bathe the area. Also many caves and small villages wait us to decide to go trekking in this region.