The central part of Algeria, in the Sahara Desert, is a region of vast sandy wastes. The sand is whipped by the wind into massive sand dunes.
In some places, these dunes are so large that the crests of neighboring dunes can be more than three miles apart. One sand dune in this region, the highest ever measured on earth, reaches a height of 1,410 feet, higher than the Empire State Building!
Huge sand dunes aren’t found only in the desert. There’s a sand dune near the town of Arcachon in France that is some 350 feet high!