Satellite image acquired by the United States National Aeronautics and Space Administration (NASA) on 8 April 1985, and dubbed “Algerian Abstract”. According to NASA, "What look like pale yellow paint streaks slashing through a mosaic of mottled colors are ridges of wind-blown sand that make up Erg Iguidi, an area of ever-shifting sand dunes extending from Algeria into Mauritania in northwestern Africa. Erg Iguidi is one of several Saharan ergs, or sand seas, where individual dunes often surpass 500 meters -- nearly a third of a mile -- in both width and height."