Figure 1. Petroglyph in the Teli-ssarhe (approximately 25.8°N, 12°E, in the Erg Murzuq) discovered by Heinrich Barth during his travel through North and Central Africa between 1849 and 1855 (Barth, 1857, Vol. I).

This figure is taken from a facsimile reprint published by the Heinrich Barth Institute and the Fines Mundi Publisher with permission from the Heinrich Barth Institute, Cologne, Germany.