Salas (also known as San Martin de Salas) is a town and concejo (municipality) in the Principality of Asturias. It lies on the road from San Sebastián to Santiago de Compostela, and on a small subtributary of the river Narcea. It is bordered on the north by Valdés, Cudillero and Pravia, to south by Belmonte de Miranda, to the east by Pravia, Candamo and Grado, and to the west by Tineo and Valdés.