Rock of the Cross Nature · O Castro de Caldelas, Terra de Caldelas, Ourense Image of O Castro de Caldelas, not of the place itself. A 1,289-metre summit that crowns the concello, far above the 763 metres at which the town sits; from its slopes the land falls away towards the Sil, which forms the boundary with the province of Lugo. Photo: HombreDHojalata (CC BY-SA 3.0) What to see and do in O Castro de Caldelas