Medieval bridge of O Bao Monument · Cervo, Mariña Occidental, Lugo A stone bridge of medieval origin over the río Cobo, included among the historic heritage of the concello of Cervo; it crossed the channel on the road that linked the ports of the coast with the inland territories of the Mariña. Photo: Loisteixeiro (CC BY-SA 4.0) What to see and do in Cervo