Causse Rouge, Limestone plateau in Occitanie, France
Causse Rouge is a limestone plateau in the southern part of the Massif Central, France, bordered by deep river valleys on several sides. The surface is dotted with sinkholes, rocky outcrops, and thin soils that support only sparse grasses and shrubs.
Around 70 million years ago, a shallow sea covered this part of France and left behind thick layers of limestone as it slowly retreated. Over time, rivers carved the surrounding valleys and water worked through cracks in the rock to shape the karst features visible today.
Dry stone walls still cross the plateau in places, marking old boundaries between grazing areas that farmers built without any mortar. These walls are one of the clearest signs of how people shaped this land over many generations.
Marked trails cross the plateau and make it possible to explore on foot throughout most of the year, though spring and autumn offer the most comfortable walking conditions. Sturdy shoes and enough water are important since the terrain is uneven and shade is rare.
Despite looking dry on the surface, the plateau hides a network of underground rivers formed by rainwater seeping through the porous rock. This water reappears much lower down, emerging as springs along the valley sides far from where it first disappeared.
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