Mountain range of a Moá Nature · Ribas de Sil, Quiroga, Lugo Image of Ribas de Sil, not of the place itself. Alignment of slate and quartzite that forms the divide between the provinces of Lugo and Ourense and closes the narrow municipal territory, separating it from the Lor basin; the two versions disagree over which side it closes, the south according to one and the north according to the other. Its slopes of scrub and chestnut groves, very steep and with clearly visible synclinal geological structures, fall abruptly onto the Sil canyon. Photo: Hermen van Beek (CC BY-SA 4.0) What to see and do in Ribas de Sil