Route to the Yew Forest of Casaio Activity · Carballeda de Valdeorras, Valdeorras, Ourense Image of Carballeda de Valdeorras, not of the place itself. A mountain route climbing from the village of Casaio up to the yew wood at 1,350 metres, crossing the mining valleys of the Casoio and offering views of the Trevinca massif, the highest in Galicia. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in Carballeda de Valdeorras