in Arizona or Egypt they are big
The Great Dune of Pyla, in La Teste-de-Buch, France.
Dune - Dune album - was created in 1995.
A desert dune is a dune formed in a desert
The tallest sand dune is in Great Sand Dunes National Park in south-central Colorado. It reaches about 750 feet above the San Luis Valley floor.
There 246 million cars in the US. There is 246 million cars in the whole US.
The size and shape of a sand dune can provide information on the prevailing wind direction, the amount of sand available for transportation, and the stability of the dune. For example, elongated dunes often form parallel to the direction of the prevailing wind, while symmetrical dunes indicate consistent wind patterns from multiple directions. Additionally, the steepness of the dune can indicate the dune's stability and likelihood of movement.
crescentic dune linear dune star dune dome dune parabolic dune
the top of a sand dune is called the crest of the dune.
This is a dune formed from salt.
The sand dune eroded during the storm. We had a picnic on the dune above the beach.
The largest sand dune is that in Argentina, Duna Frederico Kirbus, topping out at greater than 4000 ft high above its base. (And over 9000 ft above sea level.) The second highest is also in South America. [Have a crack at the list at the foot of the wikipedia article Dune.]
dune line