This descent starts near the Saint Orosia shrine and offers spectacular views of the Val Ancha.
At the very start of this descent, where the path begins, you must take extra caution: the first bend and the following section of the path are very exposed to a sheer drop. Once you have passed this section, the path goes through a forest in a fun series of twists and turns almost all the way to Isún village.
The descent from the shrine of Saint Orosia to Isún de Basa is 5.4km and drops 660m. In addition, the approach trail from Isún to Yebra de Basa is 8.7km (with a positive gradient of 80m and a negative gradient of 195m). The total length of the trail is 14.1km.