sahara

A Vast River Network Once Crisscrossed The Sahara

A Vast River Network Once Crisscrossed The Sahara

The Sahara is about the worst place on Earth to find water today, but that wasn’t always the case. Thousands of years ago, its sandy dune fields were lush and verdant. A new scientific paper helps explain why: the Western Sahara used to be irrigated by a vast river network.