Fresnedo is the schematic rock art station with the richest and most complex depictions in Asturias and, like Peña Tú and Doma del Devo (Boal), one of the best examples of prehistoric schematism in the north of the Iberian Peninsula.
High, dominant sites were chosen in all three places so that the lay of the land itself reveals the importance of the graphic message communicated through an art that is extremely concise and discreet in terms of proportions.
The paintings were discovered in 1968 and are now visible behind a protective wire mesh installed some years ago by the University of Oviedo.
Located above La Estrechura Gorge, the prehistoric site consists of five small caves, of greater or lesser depth, but all exposed to sunlight. They open onto the gorge at between 650 and 850 metres above sea level and contain different pictorial representations (far more than the fifty figures already identified) of what is called ''schematic art'' and are attributed to the Bronze Age. There are numerous, very simple representations of goats (pairs of lines alluding to legs or horns joined to another, longer outline for the animal's body). Almost always painted in red, the same occurs in the rock shelters of La Collantoria, Cuesta'l Pasu and Ganau, listed from the bottom up as you climb the trail through the site. The human figure is also repeated, sometimes expressed through very simple linear motifs.
