sand sea(redirected from Erg (landform))
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sand sea[′san ′sē]
An extensive assemblage of sand dunes of several types in an area where a great supply of sand is present; characterized by an absence of travel lines, or directional indicators, and by a wavelike appearance of dunes separated by troughs.
The flat, rain-smoothed plain of volcanic ash and other pyroclastics on the floor of a caldera.