Pilgrimage of a Nosa Señora do Mar Activity · Oia, Baixo Miño, Pontevedra Image of Oia, not of the place itself. A seafaring pilgrimage festival held in Oia on the Monday following Pentecost, with a procession down to the shore of the Atlantic; it is one of the three great devotional events of the concello together with San Sebastián and the physician saints. Photo: Contando Estrelas from Vigo, España / Spain (CC BY-SA 2.0) What to see and do in Oia