Which is a large mass of wind-blown sand, and are most common in deserted environments?

Is it possible for a sand dune to become or be considered as mountainous, despite, or given, the debatable nature of when does a hill become more plausibly defined as a 'mountain'?

The picture reminded me of the movie Dune.

DESERT. not Deserted

I grew up near the Indiana Dunes National Lakeshore. The highest dune is called Mt. Baldy.

I knew this already!!