The limestone cliffs above the reservoir Nature · Los Barrios de Luna, La Montaña de Luna, León Image of Los Barrios de Luna, not of the place itself. The waters of the Luna are hemmed in at the foot of limestone walls that reach elevations above a thousand metres; the contrast between the blue sheet of water and the bare rock defines the comarca's most recognisable landscape. Photo: PePeEfe (CC BY-SA 3.0) What to see and do in Los Barrios de Luna