Hillfort of Bouza Fariña Nature · Oia, Baixo Miño, Pontevedra Image of Oia, not of the place itself. A castro settlement of the parish of Mougás in which a Roman altar appeared, proof of the survival of the settlement in imperial times; it shares its concello with the castros of Viladesuso, das Chans and Castelo Fariña. Photo: Contando Estrelas from Vigo, España / Spain (CC BY-SA 2.0) What to see and do in Oia