cave paintings and petroglyphs aka crying cow at tegharghart in tassili najjer national park in algeria

abstract acacus africa ajjer akakus algeria algerie arid bull carving colorful cow crying desert djanet dry dune formation geology hamada heritage hill illizi landscape mountain najjer national nature orange outdoor parietal park pattern petroglyph petroglyphs reg rock sahara scenery sculpture sky stone sunny tadrart tassili tear tegharghart texture unesco