Description
Culminating at 1753 m, Mont Mézenc, the highest volcanic peak in the department, marks the divide between the Atlantic and Mediterranean waters. A phonolithic dome formed by the coalescence of several lava flows, it offers a 360° panorama.
Geography / Geology side:
Mont Mézenc is located on the border between the departments of Haute-Loire (43) and Ardèche (07), in the heart of the Massif Central, in the Velay Oriental region. It is the highest point in both departments and is part of one of the most original volcanic complexes in Europe. Its dominant position offers an exceptional panorama: to the east, the Rhône Valley and the Alps as far as Mont Blanc; to the west, the high plateaus and volcanic massifs of Cantal and Sancy.
Geologically, Mézenc is a domed volcano formed approximately 7,5 to 8 million years ago. Unlike crater volcanoes, it was formed by the accumulation of highly viscous lava from multiple emission points. These silica-rich lavas gave rise to a specific rock: phonolite, a clear and sonorous rock typical of this region. This formation is part of the last phase of volcanic activity in the eastern Velay region.
Today, the Mézenc presents a massive and rounded relief, marked by the presence of two distinct peaks: one at 1753 m altitude on the Ardèche side, the other at 1744 m on the Haut-Loire side. Separated by the watershed and the administrative boundary, these two peaks offer complementary viewpoints on the surrounding landscapes. The main dome still retains visible lava veins (dykes), witnesses to its complex volcanic past.
Hiking side:
Mount Mézenc, with its characteristic saddle shape, rises to 1753 m in Ardèche, just above the secondary summit of Haute-Loire (1744 m). From the summit, the contrast is striking between the gentle slopes to the north and the steeper reliefs to the south, offering an exceptional panorama as far as the Alps and the Massif Central.
Two main trails allow for an easy ascent in about 2 hours round trip: from the Croix de Boutières (Ardèche) or from the Maison forestière (north slope). These routes, well marked with low walls and ropes, protect the fragile flora and lead to the summit cross where signs explain the geology and ecology of the site. A loop of about 2.5 hours is also possible.
For experienced hikers, several long and challenging loops start from the village of Borée, including the Tour du Mézenc (25 km, 7 hours) and the Cirque des Boutières circuit (28 km, 8 hours). These routes cross varied landscapes, from subalpine moorland to forests, with good chances of observing marmots, golden eagles and Apollo butterflies.
Opening
All year round, every day.
We also offer:
The town was detached from Borée and set up as an independent town in 1856. The village, at the foot of the Mézenc, is to be discovered for its architecture and especially its slate roofs, including that of the Church.
Sub-lacustrine volcano, the panorama of the cross opens on the needles of viscous lava of the surroundings of Borée. The walk towards the Cirque des Boutières will allow you to find the shape of the ancient volcano which occupied the site.
The Roches de Borée are like a set of phonolitic domes exposed by erosion. Similar to the surrounding peaks (the Pialoux rock, the Gouleïou, the Touron peak), they bear witness to volcanism where the craters remain invisible.
XNUMXth century church, remodeled, rebuilt in the XNUMXth century. Architecture to discover: checkerboard in volcanic rocks and polychrome facade: yellow tuff, granite, trachyte and red scoria. Statue of the Black Virgin of Genestoux, placed above the central altar.
These are typical examples of viscous lava needles that have moved into place almost in a solid state. Here no craters but massive shapes in the landscape. Interpretation table between the two rocks.
Geologically, the Rocher des Pradoux corresponds to an isolated phonolitic, volcanic rock bar.
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