In 4th Place: Sandy Seas
The top photo above shows Algeria's Erg Iguidi sand dunes acquired by Landsat 5 on April 8, 1985.
"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," reported NASA.
