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Vales glaciais e rochas calcárias de Aquiana. Peñalba de Santiago (Ponferrada)

Inclui as cabeceiras dos ribeiros Oza, Meruelo e Villanueva, constituídos por pequenos vales que dissecam a vertente norte da Serra de Aquilanos. São ravinas de declive acentuado que fazem a ponte entre os picos.
Existem catorze circos glaciais nesta área que, apesar das encostas íngremes, apresentam um desenvolvimento notável e um bom estado de conservação. Embora existam numerosos cirques glaciais nas montanhas do noroeste da península, o fato de eles fazerem uma ponte sobre uma encosta íngreme e estarem localizados tão perto da bacia de Bierzo os torna bastante únicos. A partir dos cirques, desenvolveram-se línguas glaciais curtas, de 1 a 2 km de comprimento, com o gelo descendo até cerca de 1.150 m nos vales com nascentes maiores.
Nesta área existe também um afloramento calcário muito resistente, composto por dolomitos de mármore e mármores ordovicianos, o que gera um importante destaque topográfico mas que, dada a sua posição na parte inferior destas ravinas, é fortemente influenciado pela rede fluvial, criando curto e foices estreitas de grande singularidade.