Time: Five hours.
Leaving Navas de San Pedro to Ramblaseca, one km. from the town, just walking past the km. nº25 with a sharp bend to the left, we shall take a soft track to the right which leads to another well-preserved track which will accompany us for most of our walking tour.
Guadalentín, which flows between the Sierras del Pozo and Castril, offering a very good perspective of the river squeezed into the mountains.
The track runs on parallel to the river during the whole tour until it flows into the Bolera´s reservoir on the left bank, from where there is a wide view of the area, very rich in pine and ash trees.
When reaching the reservoir, the track crosses the river and either of tis bank can be visited since there are tracks in both banks, the left one being the most comfortable, from where we can make our way to Pozo Alcón, about 12 km. from the afore-mentioned junction between the track and the river.