Eria river Nature · Castrocontrigo, La Cabrera, León The Eria rises in the mountains of El Teleno, in the León region of La Cabrera, and runs for 101.54 kilometres through the provinces of León and Zamora before flowing into the Órbigo river as it passes Manganeses de la Polvorosa, draining a basin of 657 km²; two of its stretches, the one starting at its source and another, shorter one near the Montes Aquilanos, are included in the Natura 2000 network. It has been the backbone of the Valdería region, a source of wealth as far back as Roman times and the driving force behind mills and irrigation, and it flows down, hemmed in, from the sierra de la Cabrera towards the páramo, bathing the municipality of Castrocontrigo, which provides access to La Cabrera and, together with its capital, brings together the settlements of Morla, Nogarejas, Pinilla, Pobladura de Yuso and Torneros de la Valdería. Photo: Antramir (CC BY-SA 3.0) What to see and do in Castrocontrigo