The river canyons have different representations throughout the Iberian West, forming one of the main habitats present in the area and one of the largest longitudinal ones. Often, they are equipped with large rocky cuts. They play a key role in the distribution of life in the Great Western Iberian Ecosystem as they are the most thermal area of distribution for flora, which find at the bottom of the canyons a climate and a habitat that allows them to develop, thus increasing the rich biodiversity of the area, and it is also the nesting area for a varied and abundant community of rock birds.