Have a look at your pinkie finger (either one will do). Now imagine a line at its halfway point. That’s more or less how much rain falls each year on the Empty Quarter, the largest sand desert in the world, which takes up a large portion of the Arabian Peninsula.
National borders are only sketched in on the map of the Empty Quarter, and the physical space presents no limit to the imagination. In the absence of settlements, landmarks or any permanent sign of human activity, legends and conjecture have rushed to fill the void over the centuries.