This astronaut photograph shows classic large and small sand masses of the central Sahara Desert, where wind is a more powerful land-shaping agent than water.
The Sangre de Cristo Mountains of south-central Colorado stretch dramatically from top left to lower right of this astronaut photograph. The mountains are outlined by dark green forests at lower elevations and white, snow-capped peaks at the highest elevations. Dun-colored dunes are banked up on the west side of the mountains. These dunes make up the Great Sand Dunes National Park and Preserve.
Fraser Island, the world’s largest sand island, is located along the coastline of Queensland, Australia, and it includes Great Sandy National Park. The island was designated a World Heritage site in 1992, in part due to its outstanding preservation of geological processes related to sand dune formation.