General descriptions:
* Sand formations: This is the most straightforward and literal description.
* Ripples: This emphasizes the undulating shape of the dunes.
* Mounds: This focuses on the raised, hilly aspect of dunes.
* Landforms: This is a broader term that encompasses dunes as part of the natural landscape.
Descriptive adjectives:
* Shifting: This highlights the movement and instability of dunes.
* Majestic: This emphasizes the beauty and grandeur of large dunes.
* Serene: This captures the calm and peaceful atmosphere of a dune landscape.
* Ethereal: This describes the otherworldly and surreal appearance of dunes.
Specific types of dunes:
* Crescentic: Describes crescent-shaped dunes.
* Star: Describes star-shaped dunes with multiple arms.
* Linear: Describes long, straight dunes.
* Barchan: Refers to a specific type of crescent-shaped dune.
Ultimately, the best word to describe dunes depends on your specific needs and the impression you want to create.