It is located in the heart of the uniprovincial community, in the middle of the Pas River valley, around the cave of Hornos de la Pena and Monte Castillo, in the same group of caves as Las Monedas, Las Chimeneas, and the cave of El Castillo. The caves of Monte Castillo form an amazingly complete series, both as regards the material culture of the Old Stone Age and from an artistic point of view. La Pasiega is basically an enormous gallery, its known extent more than 120 meters, that runs more or less parallel to the slope of the mount, opening to the surface at six different places: six small mouths, the majority obstructed, of which two can be accessed for inspection.