The gorge of the Muíños dos Mouros Nature · A Merca, Terra de Celanova, Ourense Image of A Merca, not of the place itself. At Salpurido, a stream is hemmed into a rocky gorge forming falls of water beside the remains of old mills. It is the wildest corner of a district organised by the rivers Barbaña and Arnoia. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in A Merca