Sierra Seca Nature · O Riós, Verín, Ourense Image of O Riós, not of the place itself. Ridge of the concello of O Riós which, together with the ranges of Penas Libres and A Urdiñeira, closes to the east a territory covered with oak and chestnut woods in the upper basin of the Duero. Photo: Elisardojm (CC BY-SA 4.0) What to see and do in O Riós