If you can’t make it all the way to the Erg Chebbi or Erg Chigaga, then a short way south of Zagora is the next best thing: a small, but attractive sand sea at a place called Tinfou. It’s essentially one large dune, sitting in splendid isolation in a vast bowl of stony desert, bounded only by distant, serrated mountain ridges. It’s worth a stop and a picture or two, and is a peaceful spot.