Sahara

By Nicolas Niarchos, The New Yorker — For the past forty years, tens of thousands of Moroccan soldiers have manned a wall of sand that curls for one and a half thousand miles through the howling Sahara. The vast plain around it is empty and flat, interrupted only by occasional horseshoe dunes that traverse it. But the Berm, as the wall is known, is no natural phenomenon. It was built…