River Nervión. It rises in the crags of Orduña near Délica (A). It passes through Délica, Orduña, Amurrio, Luyando, Gardea, Llodio and Areta. In the latter locality it receives the waters of the Altube and enters Biscay to join the Ibaizabal in Ariz (V). In its upper basin it receives the waters of the Délica, Barracarán, Artómaña and other streams.