Sahara desert facts: largest hot desert, 31% of Africa

The Sahara Desert is bigger than most people picture: it is the world’s largest hot desert, and it covers much of North Africa. It also spans from the Red Sea and the Mediterranean to the Atlantic Ocean, making it one of Earth’s most recognizable landmasses.

How large is the Sahara Desert?

The Sahara covers 31% of the African continent. In that vast expanse, it stretches across North Africa and is bounded to the south by the Sahel.

Its scale is so large that it can be detected from other stars as a surface feature of Earth, in theory. That detail fits a desert whose name comes from an Arabic word meaning desert.

The Sahara is the world’s largest hot desert because of the subtropical ridge and descending dry air. That atmospheric setup helps shape the dry conditions that define the region.

What is the Sahara climate like?

Most of the Sahara gets more than 3,600 hours of bright sunshine per year. In its central core, rainfall is extremely scarce, and some areas average less than one millimetre a year.

The desert’s extremes have not made it completely uniform. The Sahara has alternated between desert and savanna grassland in a twenty-thousand-year cycle, shifting between two very different landscapes over long stretches of time.

Even with its dryness, the Sahara has recorded at least two snowfalls, both in Ain Sefra. That rare detail sits alongside the desert’s reputation for heat, bright light, and severe aridity.

What kinds of landscapes are in the Sahara?

The Sahara is not just one kind of terrain. It includes hamada, erg, reg, wadi, dry lakes, salt flats, oases, and unusual landforms such as the Richat Structure.

That variety gives the desert a broad visual range, from bare rock and sand seas to low-lying basins and isolated water sources. The highest peak in the Sahara is Emi Koussi, adding high ground to a region many people imagine as flat.

Why was the Sahara important in history?

The Sahara trade routes were traditionally used by caravans carrying salt, gold, ivory and other goods. Those routes turned the desert into a corridor of movement, not just a barrier.

Large numbers of slaves were also taken northwards across the Sahara. That part of its history belongs alongside the trade in salt, gold, ivory and other goods, showing how deeply human movement and exchange shaped the region.

For all its harshness, the Sahara has always been more than empty space. Its size, its landscapes, its climate, and its trade routes have made it one of the most striking places on Earth.

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