Oak grove of San Bieito Nature · Portas, Caldas, Pontevedra An oak wood that surrounds the chapel of San Bieito, in the parish of Lantaño, and serves as the festival ground twice a year; it is one of the best preserved festival carballeiras in the interior of the Salnés valley. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in Portas