Limestone cliffs of the Sil Nature · Rubiá, Valdeorras, Ourense Image of Rubiá, not of the place itself. Limestone walls more than 200 metres high looking down on the gorge of the Sil at the boundary with El Bierzo; more than a hundred bird species breed on them, among them the Egyptian vulture, the golden eagle and the peregrine falcon. Photo: Tanja Freibott (CC BY-SA 4.0) What to see and do in Rubiá