The Castril River is the essence of the park and also the reason for the unusual appearance of the area. Its waters emanate from the heart of the park and run right through it to the Portillo reservoir.
The signposted trail, which runs parallel to the river and serves as the starting point for other routes, shows you where it all began. The source of the Castril River is an unbelievably beautiful place. Cold, crystalline waters gush from the rock face, shielding the trout from its main predator, the otter. These are the truest trout, since they have not been affected by repopulation, as is common in other places. Riverine forest surrounds the river course. Willows, poplars and elms watch over it, an ideal habitat for birds such as the kingfisher and the white-throated dipper.
In addition to being an abundant natural source, water also plays a part in the shape of the the terrain. As it passes through, it erodes the calcareous massif and transforms the landscape into a karst system of high environmental value, such as the Barranco de la Osa. The waters penetrate deep inside the rock, creating notable caves such as Don Fernando. The nature of its formation makes it a great site for caving or simply those interested in geology. A clear example of the river´s influence on this park and its surroundings is the Peña de Castril Natural Monument. Remains, such as a Moorish castle at the top, give us an idea of the town’s history, and whence it gets its name.
Walking along the river, it is possible to see how altitude plays its part in the colours of the landscape, by looking at how the wooded areas vary according to height. The dark greens of the holm oaks are succeeded by autumnal red maple and oak trees and these, in turn, by the greyish greens of junipers and brooms. The light green grass on mountain pastures such as Prados del Conde, feeds the cattle herds of Segureña sheep and other herbivores such as wild goat that travel through the plateau from one mountain range to another.
On the Cerro del Buitre trail, which approaches the cliffs of Corralón, it is possible to see the nests of griffon vultures on the steepest peaks. With a good pair of binoculars and some patience you are likely to see the vultures themselves.
The town of Castril, which has interesting historical and cultural heritage, is on the outskirts of the park. This town is also known for its traditional artisan work, owing to the fact that wood, for the manufacture of boats and the glass industry, formed the bulk of its economy for some time.
Hiking is a great way to explore the Sierra de Castril Natural Park. By following the signposted Cerro del Buitre trail (11 kilometres), you will arrive at one of the highest peaks in this range: Vulture Peak. At 2,000 metres you have excellent views of the area and the chance to see up-close the birds that soar through these skies. The majestic griffon vulture is one of them, having selected these rugged lands as one of its key nesting zones.
Another interesting route leads you to the source of the Castril River, where water gushes from the rock face of this looming mountain range. This route also serves as a starting point for various other signposted trails leading up into the mountains.
Water sports * such as canoeing are available at the Portillo Reservoir. You can also go caving in the Don Fernando Cave * where you can see and explore the networks of passages and beautiful karst formations.
* Activity requires authorisation from the Natural Park.
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