the cathedral ( la cathedrale ) . tassili n'ajjer national park. algeria,

rock rocky mountain mountains desert stone stony sandstone erosion erodible arch arched window wind weathered fissure rock formation natural sahara tadrart tamezguida tadrart rouge meridional cathedral cathedrale red tassili tassili n#39aph39#ajjer n#39aph39#ajjer national park algeria algerian africa djanet dune dunes sand geology geological landform barren terrain wilderness erg nature natural landscape