Pierre Loti

Some thousands of years ago, at the beginning of our geological period, when the continents had taken, in the last great upheaval, almost the forms by which we now know them, and when the rivers began to trace their hesitating courses, it happened that the rains of a whole watershed of Africa were precipitated in one formidable torrent across the uninhabitable region which stretches from the Atlantic to the Indian Ocean, and is called the region of the deserts.