CANGAS DE ONIS or CANGAS, a town of northern Spain, in the province of Oviedo, on the right bank of the river Sella. It lies in a fertile, well-watered, partly wooded, undulating region, on the branch railway from Arriondas to Covadonga. Pop. ( Cangas de Onis trades chiefly in live-stock and coal and copper from the neighbouring mines. It was the resi dence of the first Spanish kings after the spread of the Moors over the Peninsula. Here in the 8th century lived King Pelayo, who started the Christian reconquest of Spain. His historic cave of Covadonga is only 8m. distant. A Roman bridge of fine pro portions crosses the Sella.