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The Red Ravine detritic deposits consist of sequences of red clay, gray and red sandstone, white sandstone, loose, red marl, white calcareous marl; by erosion, subsidence and collapse processes was sculpted the richness of forms that make the Red Ravine a natural monument of rare beauty. Here are some of the largest caves in the world developed in earth, of which one of 25 m.
Here can be found also several rare plant species (Cotoneaster integarrima, Ephedra distachya, Centaurea atropurpurea, Dianthus serotinus, Cephalaria radiata, Asplenium nigrum).
Images from here.