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Valles glaciares y crestones calizos de Aquiana. Peñalba de Santiago (Ponferrada)

Comprende la cabecera de los ríos Oza, Meruelo y arroyo de Villanueva, compuesta por pequeños valles que disectan la vertiente norte de los Montes Aquilanos. Se trata de barrancos de fuerte pendiente, que salvan el desnivel existente entre las cumbres.
Existen en esta zona catorce circos glaciares que, a pesar de las fuertes pendientes, muestran un notable desarrollo y un buen estado de conservación. Aunque existen numerosos circos glaciares en las montañas del noroeste peninsular, el hecho de que salven un fuerte desnivel y se sitúen tan próximos a la cubeta del Bierzo los convierte en circos de cierta singularidad. Desde los circos, se desarrollaron cortas lenguas glaciares de entre 1 y 2 km de longitud, descendiendo el hielo hasta unos 1150 m en los valles con cabeceras de mayor tamaño.
En esta zona también hay un afloramiento calcáreo muy resistente, compuesto por dolomías marmóreas y mármoles ordovícicos, que genera un importante resalte topográfico pero que, dada su posición en la parte baja de estos barrancos, está fuertemente incidido por la red fluvial, creando cortas y estrechas hoces de gran singularidad