Paisaje: naturaleza y cultura

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«Pirineos-Monte Perdido»

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This will cross-reference all available documents in our data base related to the UNESCO World Heritage Site

Añisclo Canyon

The peaks of the Monte Perdido massif and the mountains of Las Sucas or the Tres Marías are divided by the magnificent Añisclo Canyon.

The waters from Collado de Añisclo mountain join those tumbling over the edge at the Fuen Blanca spring, which emerges from the very bowels of Treserols.

The head of the valley is clearly glacial in its morphology, as demonstrated by its characteristic U-shape. As the glacier here faced south, it did not descend as far as those that were oriented north.

For this reason, the Bellos River flows hurriedly through immense limestone clusters, running down the two stretches of the gorge: firstly, it gushes down Añisclo Canyon, which runs north-south, till it comes to the Aso Gully, at which point it veers south-east along the Desfiladero d'As Cambras defile.
Along its course, the Bellos River is fed by numerous secondary gullies such as the Arrablo and Pardina gullies.

If you look up from the bottom of the valley, you might feel dizzy at the sight of the rock faces that form it. This is a fluviokarst canyon created by two agents, the hydraulic action of the river and the dissolving and collapse of subterranean structures within the massif.

The most outstanding of the relief formations include the Sierra Custodia and Mondoto and Sestrales mountains.


The vegetation is by and large dense and prefers a damp habitat, though large forests have been unable to grow due to the lack of space. Even so, there are is a wide diversity of woods where beech, pine, oak, fir, yew, maple and other trees grow, as well as numerous other plants that grow on rocks, notably the long-leafed butterwort, an insect-eating plant.


The effect of temperature inversion is evident in the distribution of species across the sides of the canyon.