The Sahara is the world's second largest desert, after Antarctica. At over 9,400,000 square kilometres (3,630,000 sq mi, length: 4,800 km (3,000 mi), width: 1,800 km (1,100 mi)), it covers most of Northern Africa, making it almost as large as Europe or the United States. The Sahara stretches from the Red Sea, including parts of the Mediterranean coasts, to the outskirts of the...