Amorebieta - Etxano - Zugastieta - Gorozika - Bizkargi - Boroa - Amorebieta

Highly recommended route except for the section between Etxano and Waypoint 2. I tried to find an alternative path to those on Wikiloc and saw on Google Maps that there seemed to be a path there, but it turned out to be unridable due to the amount of undergrowth and thorns. The result was several bike carries and scratched legs. Nobody should try to ride up there with a bike because it's impossible. From there on, a beautiful route with a descent to Zugastieta, a climb to Gorozika on asphalt and then on trail to Bizkargi. Beautiful views from there. You can even see the wind turbines of the Superport of Santurtzi. I changed my initial idea of going back and descending via Larrea, seeing that the descent towards Boroa looked very good and taking the opportunity to clean the bike at the gas station in Boroa. Indeed, the descent (with a single 200 m uphill stretch where I had to put a foot down) is somewhat technical due to ruts and a few muddy puddles, but with care it is very enjoyable.