The Montagnes Noires (French: 'the black mountains'), also known as the Montagne Noire (French: 'the black mountain') and in Breton as Meneziou Du are an east-west oriented range of hills in Brittany centred around the town of Gourin. They culminate in the peak of Roc de Toullaeron (Breton: Roc'h Toull-al-Laeron) which attains a height of either 318m or 326m. Other significant peaks include Ar Menez (304m) and Montagne Noir (307m) (or, in Breton: Menez Du). They are composed from a range of Precambrian, Ordovician, Silurian and Devonian rocks forming a part of the Variscan orogen and include sandstones, quartzites and slates.
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