Mountain range of o Barbanza Nature · Boiro, Barbanza, A Coruña A granite ridge separating the ría de Muros e Noia, to the north-west, from the ría de Arousa, to the south-east, dotted with mámoas and petroglyphs and with long expanses of scrub and peat bog on its summit plains. Photo: Paulo Brandao (CC BY-SA 2.0) What to see and do in Boiro