For centuries, nomads have wandered the unforgiving plains of the Sahara, guided by natural beacons and in tune with the desert's cycles. But desertification is threatening their traditional way of life. The Sahara advances by six miles a year, consuming oases, water wells and engulfing whole cities. In this stunning documentary, nomadic women tell their stories. Filmed in a cinema-verité style, it's a poignant study of a vanishing way of life.