Ulla River through Monterroso Nature · Monterroso, Ulloa, Lugo Image of Monterroso, not of the place itself. The Ulla enters Monterroso newly born and crosses the municipality between meadows and riverside woods; its banks keep centuries-old oaks and old mills that have given their names to several of the municipality's signposted routes. Photo: José Antonio Gil Martínez (CC BY 2.0) What to see and do in Monterroso