This image looks remarkably like groves of trees growing among Martian dunes. But, the trees are an optical illusion.
Currently most of its terrain is made up of desert plains and sand dunes with some savanna around the Niger river.
Clamber up, slide down; gaze in awe at the wildlife that miraculously survives in this sea of sand; and be ready to take many photos as the colors of the dunes change constantly.
They are actually dark streaks of sediment on the downwind side of the dunes.
To the southeast lies the spectacular Khor al Adaid or "Inland Sea", an area of rolling sand dunes surrounding an inlet of the Gulf.
Archaeology received a gift from nature in 1850, when a strong storm hit the Orkney Islands, stripping away sand dunes and uncovering the remains of the Skara Brae settlement.
All of the sand dunes, however, form part of a larger dune field nearly encircling the lake.
The world's third largest "hot" desert, the Gobi is home to some of Earth's largest dunes, as well as unique wildlife like the endangered Gobi bear.
It is backed by sand dunes on which two shaggy camels rest.
The dunes on either side presented a palette of tan, butterscotch, pink and russet, and were etched with delicate fingerprint-like whorls and ridges.
Their fictional world has been replaced by a fantastic real one of trackless dunes and icy crags.
Bulldozers have already cut a road through the cliffs, flattened sand dunes and torn up vegetation to create housing blocks.
The peaks of these sand dunes give a spectacular panoramic lookout over the township, surrounding sand hills, farmlands, coastline, islands and ocean.
Sand dunes sprawl along the coast of northeastern Brazil, sometimes extending kilometers inland.
Eurasian thistle growing in sand dunes and dry chalky soils.
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