Recorra el interior de Urdaibai.

Starting from Muxika, we head for the Gerekiz pass, passing through the Ugarte neighbourhood. We descend to Olabarri, where we leave the BI-2121 road to climb the BI-3213 towards Errigoiti. Next to the Uria neighbourhood we turn off towards Bizkaigane to enjoy its splendid views.

We descend to Forua via Metxika, then continue to Gernika, where we start the long climb to Mendata. After regaining our strength, we descend to Muxika through the Lamikiz neighbourhood.