This is a place full of dark secrets. Embedded in the valleys of the River Sil, the mountains of A Lastra and their limestone peaks are a rarity in the Galician landscape, where granite prevails.
Pala Cumbeira, Pala da Zorra, Pala Pereda, Pala Cubelas... In the park, there are numerous caves – which are called "palas" here – and this is why it has become a place of pilgrimage and for speleologists and amateurs. In these caves – a magical kingdom of stalactites and stalagmites – are some of the largest colonies of bats in Spain. The park is also a bird refuge.