Pools of Melón Nature · Melón, Ribeiro, Ourense The River Cerves, which rises at around 1,000 metres in the serra do Faro de Avión, strings together on its descent a succession of falls that have hollowed out of the rock pools of clear water known as mergeiras. Photo: Bene Riobó (CC BY-SA 4.0) What to see and do in Melón