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Longman Dictionary of Contemporary English
sand dune
noun
EXAMPLES FROM CORPUS
▪ Parts of the fairway had reverted to sand dune.
▪ The only hazard they are likely to encounter is a sand dune.
Wiktionary
sand dune

n. (context geology English) A large, semi-permanent mound of windblown sand, held together by specialized plants, common along seashores and in deserts.

WordNet
sand dune

n. a ridge of sand created by the wind; found in deserts or near lakes and oceans [syn: dune]

Usage examples of "sand dune".

Impossibly, he saw the dark figure of a man, a silhouette standing high on a sand dune, a tattered cloak blowing about him.

I live just down the shore, Miss Wright, in a place perched on top of a sand dune.

Hal and Ruth found themselves standing alone on a sand dune, moonlight painting the desert a ghostly silver around them.