Reservoir of Arbón Nature · Coaña, Eo-Navia, Asturias The Arbón reservoir, opened in 1967 with a capacity of 38.20 cubic hectometres, dams the Navia river as it passes through the municipality of Coaña, downstream of the Doiras reservoir and only 12 kilometres from its mouth on the Cantabrian Sea, which makes it the river's first hydroelectric development. Its dam is located in the parish of Arbón, in the municipality of Villayón, on the border with Coaña, and its waters also extend into the municipality of Boal; in the reservoir the Navia receives the Cabornel and Riofrío rivers. Its sheet of water is set between wooded slopes and defines the landscape of the lower valley, stepped by successive hydroelectric developments; besides its energy use, the reservoir hosts sporting and recreational activities. Photo: Ipolober (CC BY-SA 3.0) What to see and do in Coaña