The rugged district of Las Villuercas represents an orographic core surrounded by ancient peneplains, and constitutes of a series of parallel ridge-and-valley systems aligning in a northwest-southeast direction. It was folded during the Hercynian orogenic movement, leveled by erosion throughout the Mesozoic and Cenozoic eras, and rejuvenated by fracturing with the rising and falling of blocks during the Alpine orogenic movement. Finally, the embedding of the current river network in this intensely folded and fractured territory has configured the main geomorphologic characteristic of the region, which is generally referred to as “Appalachian relief” as an analogy with the peneplain relief forms to be found in the Appalachians of North America.