Reservoir of Sequeiros Nature · Ribas de Sil, Quiroga, Lugo Hydroelectric reservoir on the Sil that stills the river on a stretch of canyons and geological folds, on the boundary between the provinces of Lugo and Ourense, within the geopark of the Montañas do Courel. Photo: Hermen van Beek (CC BY-SA 4.0) What to see and do in Ribas de Sil