Fragas do Navea Nature · San Xoán de Río, Terra de Trives, Ourense Image of San Xoán de Río, not of the place itself. The Navea valley preserves woods of oak and birch on gentle slopes, one of the best preserved forests of a comarca in which the chestnut occupied much of the hillside. Photo: xolopi (CC BY 3.0) What to see and do in San Xoán de Río