Biosphere Reserve of the Omaña and Luna Valleys Nature · Riello, La Montaña de Luna, León Image of Riello, not of the place itself. Biosphere reserve created in 2005 that protects 81,159 hectares shared between the León municipalities of Sena de Luna, Los Barrios de Luna, Soto y Amío, Murias de Paredes, Riello and Valdesamario, in the districts of Omaña and Luna. Bounded by mountain ranges linking the Cantabrian range with the mountains of León, with heights of over 2,000 metres in the sierra de la Cañada, it includes the basins of the rivers Luna and Omaña. Its birch woods, oak woods and upland pastures shelter brown bear, capercaillie, broom hare and Iberian desman. It is home to 86 population centres traditionally devoted to farming and livestock, with a coal-mining industry now in decline, and it preserves more than a hundred examples of religious architecture, mostly Baroque. Photo: David Perez (CC BY 3.0) What to see and do in Riello