The Montagnes Noires , also known as the Montagne Noire and in Breton as Menez Du 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 which attains a height of either 318m or 326m. Other significant peaks include Ar Menez and Montagne Noir . 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.
The hills form a part of the border between the départements of Finistère and Morbihan and just extend into Côtes-du-Nord.
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