Mont Chenaillet, Mountain summit in Hautes-Alpes, France.
Mont Chenaillet rises to 2,650 meters and forms a natural border where three valleys meet: Susa, Durance, and Cerveyrette. The mountain displays the geological structures of an ancient submarine volcano whose rocks were lifted during the formation of the Alps.
The mountain served as an important military zone with fortifications from the 17th century until World War II, marking the border between France and Italy. Its strategic location shaped its military legacy for centuries.
Geologists and students visit the mountain to study its pillow lavas and ophiolite rocks from an ancient submarine volcano. These formations draw researchers who want to understand how volcanic activity shaped the Alps.
The ascent begins near the La Chau farms via marked trails that pass mountain lakes along the way. The route offers several rest points and clear markings so hikers can easily follow the path.
The mountain contains well-preserved sections of a submarine volcano that is 155 million years old, lifted during the creation of the Alps. This rare geological formation clearly shows how ancient ocean structures are now visible as part of the mountain.
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