Sahara guide · Rachid Excursions
15 Fascinating Facts About the Sahara Desert
The Sahara covers about 9.2 million km² (3.6 million mi²), roughly the size of the contiguous United States or China, which makes it the largest hot desert on Earth. Written in Marrakech and checked against the cited climate and earth-observation references below.
By Rachid — Owner and itinerary editor, Rachid Excursions · Updated 27 July 2026
15 facts, checked and current
1. It is the largest hot desert on Earth
The Sahara covers roughly 9.2 million km² (3.6 million mi²) — about the size of the contiguous United States or China. Only the polar deserts of Antarctica and the Arctic are larger, and neither of those is a hot desert.
2. It spans eleven countries
The Sahara stretches across Morocco, Algeria, Tunisia, Libya, Egypt, Sudan, Chad, Niger, Mali, Mauritania and Western Sahara — from the Atlantic Ocean on the west to the Red Sea on the east, and from the Atlas Mountains to the Sahel savannah.
3. "Sahara" literally means "desert"
The name comes from the Arabic word ṣaḥrāʾ (صحراء), which simply translates as "desert" or "wilderness". So "Sahara Desert" is technically "Desert Desert" — a linguistic quirk locals like Rachid often smile at.
4. Only about 25% of it is sand dunes
Popular imagination pictures endless dunes, but the Sahara is mostly gravel plains (reg), rocky plateaus (hamada), dry valleys (wadis) and salt flats. The famous dune seas — called ergs — cover roughly a quarter of its surface. Morocco's Erg Chebbi and Erg Chegaga are two of the most accessible.
5. Erg Chebbi dunes reach up to ~150 metres tall
The dunes above Merzouga rise to around 150 m (490 ft) at their highest crest — roughly the height of a 45-storey building. They shift shape constantly with the wind, which is why every sunrise looks slightly different.
6. It gets cold — really cold — at night
Summer daytime temperatures regularly exceed 45 °C (113 °F), but the dry air holds almost no heat overnight. Winter nights in Merzouga or Chegaga can drop close to freezing, and January mornings sometimes see frost on the dunes. Bring layers — a fleece is not optional.
7. Snow has fallen in the Sahara
In January 2018 and again in January 2022, the town of Aïn Séfra in northern Algeria — nicknamed the "gateway to the desert" — woke up to red dunes dusted in snow. It is rare, but it happens roughly once a decade.
8. It was green just 6,000 years ago
During the "African Humid Period" (roughly 11,000 to 5,000 years ago), the Sahara was a mosaic of grasslands, lakes and rivers home to elephants, giraffes and hippos. Prehistoric rock art in Tassili n'Ajjer (Algeria) and near Aït Ben Haddou shows this vanished green world in astonishing detail.
9. Camels are not native — they arrived around 200 CE
The one-humped dromedary was introduced from Arabia in the early centuries CE and transformed trans-Saharan trade. Berber and Tuareg caravans of thousands of camels once carried gold, salt and books between Timbuktu, Sijilmassa and Marrakech.
10. The Sahara fertilises the Amazon
Every year, NASA satellites track roughly 182 million tonnes of mineral-rich dust lifted from the Bodélé depression in Chad and blown across the Atlantic. Around 27 million tonnes of it settle in the Amazon basin, delivering phosphorus that the rainforest could not otherwise replace.
11. It is one of the best stargazing places on Earth
Low humidity, sparse settlement and a flat horizon can create very dark skies away from camp lighting. Milky Way visibility depends on clouds, moon phase, season and the exact camp location, so check a current sky forecast before travel.
12. It is home to more life than you think
The Sahara supports fennec foxes, desert monitor lizards, addax antelopes, dorcas gazelles, sand cats, dromedaries and more than 500 plant species. Most animals are nocturnal or crepuscular — dawn and dusk on a camel ride are your best chance to spot tracks.
13. The Sahara has real oases — including one you can visit in a day
Underground aquifers surface in more than 90 major oases. Morocco's Draa Valley alone strings dozens of them along a 200 km palm belt south of Ouarzazate. On our Merzouga route you cross the Todra and Dades gorges, both fed by mountain springs.
14. The Sahara is expanding — but slowly
Studies from the University of Maryland show the Sahara has grown roughly 10% since 1920, mostly southward into the Sahel. The change is driven by both natural climate cycles and human activity, and it is one reason sustainable low-impact tourism matters here.
15. You can sleep in it — comfortably
Modern desert camps in Erg Chebbi and Chegaga range from simple Berber nomad tents to "luxury" camps with real beds, en-suite bathrooms, hot showers and Moroccan dinners served under the stars. It is one of the few places on Earth where you can go from a 4×4 to a candlelit tagine to the Milky Way in the same evening.
Sources and verification
- Saharan dust feeds Amazon
NASA Earth Observatory
Satellite-observed Saharan dust transport and scale.
- Morocco historical climate data
World Bank Climate Change Knowledge Portal
Long-term climate context; local conditions still need a current forecast.
Frequently asked questions
Sahara journeys we run from Marrakech
Notre programme partagé à Merzouga : départ de Marrakech à 07h30, traversée du Haut Atlas par le col du Tizi n'Tichka jusqu'à la kasbah d'Aït Ben Haddou, classée par l'UNESCO, et à la kasbah de Taourirt, puis la vallée des Roses et le Dadès. Le jour 2, route vers Merzouga pour une balade à dos de dromadaire au coucher du soleil et une nuit en bivouac berbère, avec tambours et dîner. Le jour 3, lever du soleil sur les dunes, puis retour à Marrakech — ou continuation vers Fès pour 25 € de plus.
Zagora 2 jours — Circuit dans le désert
2 jours · 1 nuit · Aït Ben Haddou · Ouarzazate · Balade à dos de dromadaire · Bivouac dans le désert
Une traversée classique en deux jours, de Marrakech à la vallée du Drâa et au Sahara de Zagora. Montée au col du Tizi n'Tichka, matinée à Aït Ben Haddou, classé par l'UNESCO, avec un guide local, visite de la kasbah de Taourirt à Ouarzazate, puis route vers le sud jusqu'à Zagora pour une balade à dos de dromadaire au coucher du soleil et une nuit en bivouac berbère sous les étoiles. Réveil au lever du soleil sur les dunes et retour à Marrakech par Ouarzazate. Une alternative plus courte et plus facile à Merzouga : la même magie du désert en deux fois moins de temps.
Notre circuit phare au Sahara : traversez le Haut Atlas par le col du Tizi n'Tichka, visitez la kasbah d'Aït Ben Haddou, classée par l'UNESCO, et la vallée du Dadès, puis partez à dos de dromadaire dans les dunes de l'Erg Chebbi pour dormir à la belle étoile dans un bivouac berbère traditionnel.
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