Dune: accumulations of wind-blown sand in ridges or mounds that lie landward of the beach and usually parallel to the shoreline.

UNESCO: L O S S A R Y

Stony ridges gave way to tumbled boulders, slopes of sifted gravel, and then sand, blown into shifting dunes.

NEWYORKER: The Martian Chroniclers

It takes seven or eight hours and strong legs to hike the whole crossing, past ice-blue crater lakes, over snow-covered ridges and through windswept mountain deserts, where totara trees cling to the soft black volcanic sand.

BBC: A return to Middle-earth