River Izoria. It rises in Sierra Salvada, in the foothills of the peak of Iturrigorri. It flows through the vicinity of Lendoño de Arriba, and the villages of Belandia, Murga, Izoria and Olabezar. It receives the waters of the Salmantón and Idas ravines. It flows into the Nervión near Murga, opposite Mount Azamaiki.