The name 'Demoiselles Coiffées' translates to 'ladies with hairdos,' referencing the boulder caps resembling hats.
These formations are scientifically classified as demoiselles or hoodoos, a common phenomenon in areas with heterogeneous soil deposits.
The base of the pillars is composed of glacial moraine and compressed sediments from the last ice age.
The erosion process that created these shapes is ongoing and eventually leads to the collapse of the pillars once the supporting soil erodes too far.
The site is located within the Durance river valley, which is geologically active regarding sedimentary deposition and erosion.
Les Demoiselles Coiffées are geological formations known as hoodoos or fairy chimneys located near Le Sauze-du-Lac. These columns consist of soft, crumbly earth topped by a large, protective boulder of harder limestone. The formation occurs through differential erosion, where the harder rock shields the softer soil beneath it from rain and wind. Over time, the surrounding material is worn away, leaving these slender pillars standing in relief. They are situated on the slopes overlooking the Serre-Ponçon reservoir. The site is a protected natural feature of the Hautes-Alpes region. The structures continue to evolve as natural elements slowly erode the remaining support pillars.
From the designated viewing area along the access trail that provides a panoramic view of the pillars against the reservoir backdrop.
Wear sturdy hiking shoes with good grip as the paths are uneven and can be slippery.
Bring binoculars to observe the details of the rock formations without needing to climb too close to fragile edges.
Carry sufficient water as the site is exposed and lacks natural shade.
Climbing on or touching the formations, as they are fragile and pose a rockfall risk.
Stay on marked trails to prevent further erosion of the delicate soil and ensure personal safety.
