Montagnes Noires

The Montagnes Noires (French pronunciation: [mɔ̃taɲ nwaʁ], 'black mountains'), also known as the Montagne Noire (French, 'black mountain')^[1] and in Breton as Menez Du^[2] are an east–west oriented range of hills in Brittany centred on 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^[3] or 326m.^[4] Other significant peaks include Ar Menez (304m) and Montagne Noire (307m) (or, in Breton: Menez Du).^[5] 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.^[6]

The hills form a part of the border between the départements of Finistère and Morbihan and just extend into Côtes-du-Nord.