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Photo: Project Apollo Archive, Wikimedia Commons, Public domain.Think the Sahara is just a giant, empty pile of sand? Think again! Test your knowledge on the fascinating history, surprising wildlife, and ancient mysteries of the world's most famous hot desert.
Dune Wanderer 0–4 · Desert Pathfinder 5–8 · Master of the Sands 9–10
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The tiny fennec fox weighs only about 1.5 to 3.5 pounds, making it smaller than an average house cat. Its massive ears, which can grow up to 6 inches long, serve a dual purpose: they help the fox locate underground prey and act as natural radiators to keep the animal cool under the scorching desert sun.
Photo: Drew Avery, Wikimedia Commons, CC BY 2.0.
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The Tuareg are a nomadic Berber people known for their striking blue garments, which are dyed using indigo. The dye often rubs off on their skin, earning them their famous nickname. Fascinatingly, Tuareg society is traditionally matrilineal, and it is the men, not the women, who wear face veils starting at puberty.
Photo: Amine loua, Wikimedia Commons, CC BY-SA 4.0.
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In medieval West Africa, salt was so valuable that it was one of the main goods traded across the desert for gold. At Taoudenni, salt is still dug by hand from an ancient dry lakebed and cut into heavy slabs, and some of the last camel caravans of the Sahara carry them on a journey of about three weeks to Timbuktu.
Photo: Taguelmoust at French Wikipedia, Wikimedia Commons, CC BY-SA 3.0.
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While we often think of deserts as hot and sandy, a desert is scientifically defined by its lack of precipitation. The freezing Antarctic Desert is the largest on Earth, spanning over 14 million square kilometers. The Sahara is actually the largest hot desert, but it ranks third overall behind both Antarctica and the Arctic!
Photo: Stephen Hudson, Wikimedia Commons, CC BY 2.5.
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The Richat Structure is a spectacular, deeply eroded geological dome in Mauritania that spans nearly 40 kilometers in diameter. Originally mistaken for a giant meteor impact crater, scientists now know it was formed by gradual wind and water erosion of uplifted rock. It is a major landmark for astronauts in orbit.
Photo: NASA, Wikimedia Commons, Public domain.
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Roughly 5,000 to 11,000 years ago, the Sahara was a lush grassland filled with lakes, rivers, and diverse wildlife like hippos and giraffes. A slight shift in Earth's orbital tilt gradually altered monsoon patterns, turning this green paradise into the dry desert we know today in just a few centuries.
Photo: NASA, Wikimedia Commons, Public domain.
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The Bodélé Depression is a massive dry lake bed in Chad. Strong winds sweep through its mountain passes, kicking up mineral-rich dust made of ancient microorganisms. This dust travels all the way across the Atlantic Ocean to fertilize the Amazon rainforest, demonstrating how our planet's ecosystems are deeply linked.
Photo: NASA, Wikimedia Commons, Public domain.
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Spanning across Egypt, Libya, Chad, and Sudan, this colossal underground water system holds an estimated 150,000 cubic kilometers of ancient freshwater. This 'fossil water' was trapped deep underground during the wetter prehistoric eras and is now tapped to sustain life and agriculture in some of the world's driest regions.
Photo: Jaap Berk, Wikimedia Commons, Public domain.
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Emi Koussi is a huge, inactive shield volcano in northern Chad that rises to about 3,400 metres above sea level. It is so big that its whole caldera is easy to see from space. Mount Tahat in Algeria is impressive too, but it is lower, at about 2,900 metres.
Photo: ISS Expedition 26 crew, Wikimedia Commons, Public domain.
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George Lucas filmed many iconic desert scenes in Tunisia and named the desert planet Tatooine after the real town of Tataouine. While Tataouine itself wasn't heavily used for filming, the nearby town of Matmata features the famous underground troglodyte dwellings that served as Luke Skywalker's childhood home.
Photo: Averater, Wikimedia Commons, CC BY-SA 3.0.
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