Exit the village of Viguera through La Barga street, near the church towards the cemetery, and start going up a trail that crosses a road that gives access to gypsum quarries. Do not take any of the paths on the left. Continue ascending until you reach a hill. On the right you can see at all times a unique rocky promontory known as Viguera Castle. Continue on the trail. There is smooth descent until you reach a river bed where there is a trough. Then, cross a fence to continue on a route surrounded by old croplands and descend to a ravine. The environment here is distinctly Mediterranean, with many holm oaks, needle furzes and thyme. The path continues on the hillside controlling the Iregua River Basin until it reaches a deep valley called Barranco Hondo. Once you leave it behind, change your course a few metres to see a natural spring with unique forms. The path runs along an itinerary of small slopes among enormous oaks, beeches and boxwoods. At some points there are natural outcrops from which you can see the national road and the orchards of the Iregua River. The path leads to a forest trail. Continue on it 200 metres to the left, until you reach a hillock called Peña Seto, where you leave the trail and descend down a path until your reach a narrow crossing. Be careful when passing this, as there are rockfalls. Continue descending on the scree foothills at the base of great limestone crags. There is abundance of bird wildlife in the rocks until you pass next to a house called Ribalosbaños, where there is a natural spring that provides for the factory. The house is in the low area near the Iregua River. The path continues near the river, passing next to remains of a stone tower that was a former limekiln. You will pass behind the Peñaclara factory until you reach the bridge of the national road that crosses the Iregua River. The path passes under the bridge and follows the right river bank, leaving the remains of a chapel on the left until you reach Torrecilla and enter the Barruelo district. Once inside this district, cross the beautiful medieval bridge over the Iregua River and access the city centre of Torrecilla, where you can visit the riverside park of the San Lázaro Chapel.