Mountain range of a Toxiza Nature · Alfoz do Castrodouro, Mariña Central, Lugo Image of Alfoz do Castrodouro, not of the place itself. A range of circular outline formed by a great mass of granodiorite that stretches from near Mondoñedo as far as Ferreira do Valadouro; it peaks at 838 metres and erosion has left striking boulders and crags on its slopes. Photo: Elisardojm (CC BY-SA 4.0) What to see and do in Alfoz do Castrodouro