Culminating at 1754 m, it straddles the municipalities of Borée and La Rochette. It is an immense natural barrier which determines the division of waters between the Atlantic and the Mediterranean.
Description
The Mézenc is a complex phonolithic dome formed by the coalescence of several lava rises. It is located in the heart of one of the most original volcanic provinces of Europe due to its richness in phonolitic reliefs while it dominates landscapes with a contrasting character. Like all the other phonolite reliefs in this area, it was formed after the construction of the eastern Velay volcanic massif, which extends around the Mézenc between 11 and 7 million years (Ma). According to the dates it would be between 7.5 and 8 Ma. It dominates towards the East the country of Boutières, vigorously cut by the rivers of the Rhone slope. From its summit, the view stretches from the Rhône valley over the whole chain of the Alps, from Mont Blanc to Mont Ventoux and towards the west as far as Plomb du Cantal and Puy de Sancy.
The phonolite that makes up this dome is a clear and resonant rock, enriched in silica compared to basalts and therefore more acidic.
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