A large area covered with sand dunes. A sand sea such as those found in Earth's large deserts.

(Saharan) Range of sand dunes

Extensive region, or "sea," of composite dunes formed by wind-transported sand and found in major deserts.

A very large sand mass; a sand sea. From a Hamitic word areg or ergh for such a sand sea in the Sahara.

Sand seas formed by the accumulation of dunes in a desert.

vast sea of huge rolling sand dunes, devoid of vegetation, usually hundreds of miles wide

An area of shifting sand dunes.

An Arabic term for the great sand deserts, or sand "seas", of the Sahara Desert (actually, the term erg in Arabic means "a vein or belt"). An erg can be as large as France, covering well over 260,000 sq km (100,000 sq mi). An erg consists mostly of sand, shaped by the wind into dunes, and it may contain salt flats and the exposed gravel surface of the desert floor. ( Langewiesche 1996)

An erg (also sand sea or dune sea) is a large, relatively flat area of desert covered with wind-swept sand with little to no vegetation cover. The term takes its name from the Arabic word erg , meaning "dune field". Strictly speaking, an erg is defined to be a desert area that contains more than 125 square kilometers of eolian sand and where sand covers more than 20 percent of the surface.