Sand dunes in the Sahara desert in Africa. The Sahara Desert is the world’s largest hot desert, located in northern Africa. The climate is hot and dry, with temperatures recorded as high as 50°C.

Paleoclimate and archaeological evidence tells us that, 11,000-5,000 years ago, the Earth's slow orbital 'wobble' transformed today's Sahara ... across North Africa from the hyperarid desert ...