Sahara Desert

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Why the
Sahara Desert
is special

The Sahara Desert is now about 5,000 kilometers (3,000 miles) wide and up to 2,000 kilometers (1,200 miles) from head to foot, making it roughly as big as the United States.

Sahara Desert
tips and insights

How it came to be

Green vegetation blanketed the Sahara terrain 10,000 years ago, a heartbeat in geological time. Unfavorable climactic changes gradually turned this North African land into a desert of astounding size.

Still expanding

The Sahara Desert is still expanding along its southern border at an alarming rate. Some blame long-term climactic trends, others point the finger at ill-advised farming and herding techniques along the Sahara Desert fringes.

Rainfall

It seldom rains in most of the Sahara Desert. Some spots haven't seen a rain drop in years. But on those rare occasions when it rains, it can downpour.

More than just sand dunes

While most people envision the typical Sahara Desert landscape as rolling sand dunes (such as the landscape in the photo), in reality only 25% is sandy. The rest consists of geological features such as gravelly plains, parched plateaus and rocky mountains. The unifying attribute is extreme aridness, which predominantly defines the word "desert".

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