A vast region of desert sand dunes is called a(n)_________.

Name: A vast region of desert sand dunes is called a(n)_________.
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An erg is a vast region of desert sand dunes that cover at least 125 square miles. A dune field is a more general term that refers to any area covered by sand dunes, whether big or small. A wadi is a dry riverbed that fills with water during flash floods. A loess region is an area where wind-blown silt deposits have accumulated over time, creating a distinctive soil type.

A Vast Region of Desert Sand Dunes Is Called A(n)_________