In the heart of the Sahara lies the Tenere Desert, a barren landscape whose name is literally translated to “where there is nothing.” But in this apparent nothingness lie more than 800 petroglyphs, including an exceptional carving of two towering giraffes.

The Dabous Giraffes were first recorded by Christian Dupuy in 1987. Subsequent field trips brought more attention to the site, and more than 820 individual images have since been found engraved on rocks in the area. Around 700 of these petroglyphs represent animals, including buffalo, ostriches, antelope, lions, camels, and rhinoceros. About 60 petroglyphs represent humans, and 160 or so are open to interpretation.

But it’s the two large giraffes that are the real jewels of the collection. Believed to be between 6,000 and 8,000 years old, the pair of giraffes are engraved onto the gently sloping, weathered surface of a large sandstone rock. Various techniques were used to create them, including scraping and smoothing of certain areas, the deep engraving of the outlines, and low-relief carving of the dots all over the body, which are two to three centimeters deep. For such ancient petroglyphs, the detail is truly impressive.

Then there’s the sheer size of the carvings. The two giraffes are believed to represent a male and a female, with the larger male in front and the smaller female standing behind. The larger of the two is almost 18 feet tall (5.4 meters), or 21.4 feet tall (6.35 meters) when measured from the tip of its ears to the extremity of its hind leg. This makes it the largest petroglyph in the world, and the largest known rock carving of an animal.

Intriguingly, each giraffe also has an etched line leading down from its mouth to an engraved human figure below (something found in other ancient representations of giraffes in the Sahara). Does this perhaps represent a symbolic relationship between giraffes and humans or, more practically, ancient attempts at domestication?