The Arnoia as it passes through Paderne de Allariz Nature · Paderne de Allariz, Allariz - Maceda, Ourense Image of Paderne de Allariz, not of the place itself. The river is hemmed in on a stretch of chestnut groves, alder woods and old mills included in the Área de Allariz biosphere reserve, declared by Unesco in 2005. It is one of the best preserved river corridors of Ourense. Photo: Elisardojm (CC BY-SA 4.0) What to see and do in Paderne de Allariz