​PILONA, a town of northern Spain, in the province of Oviedo; between the right bank of the river Pilofia, a left-hand tributary of the Sella, and the Sierra de Abes (3268 ft) Pop. (1900), 18,228 Though officially classed as a town, Pilofia is rather a densely populated mining and agricultural district. It is served by the railway from Infiesto, on the river Pilona, to Oviedo and Giién