A medium mountain route over the Aratz massif and the Sierra of Aizkorri which includes the four highest peaks in the Basque Autonomous Region (Aratz – Aizkorri – Aketegi). From the town of Zegama (296m) it is climbed up to the high of Otzaurte (652m ) and then, from the mountain pass mentioned before, a route along paths and mountain tracks of great natural beauty. It combines forests, principally beech, with steep rocky slopes and high grazing land. It is very technical and with a high level of difficulty.