Hillfort of Mones Nature · Petín, Valdeorras, Ourense Image of Petín, not of the place itself. A pre-Roman fortified settlement above the parish of Mones, evidence of the castro communities that occupied the Sil valley before Rome exploited the mineral wealth of these mountains. Photo: Mayte Ríos (CC BY-SA 4.0) What to see and do in Petín