Edo river Nature · O Castro de Caldelas, Terra de Caldelas, Ourense Image of O Castro de Caldelas, not of the place itself. A tributary of the Sil that waters the western half of the concello among oak and chestnut woods, set into a relief where hardly any flat ground is left and where meadows replace crops. Photo: Wamba Wambez (CC BY-SA 3.0) What to see and do in O Castro de Caldelas