Dune
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A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex. A large dune complex
The Maspalomas Dunes of Gran Canaria, Canary Islands, Spain
Isolated barchan dunes on the surface of Mars. Dominant wind direction would be from left to right.
Rub' al Khali (Arabian Empty Quarter) sand dunes imaged by Terra (EOS AM-1). Most of these dunes are seif dunes. Their origin from barchans is suggested by the stubby remnant "hooks" seen on many of the dunes. Wind would be from left to right.
Large linear seif dunes in the Great Sand Sea in southwest Egypt, seen from the International Space Station. The distance between each dune is 1.5–2.5 km.
Landform
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A landform is a land feature on the solid surface of the Earth or other planetary body. They may be natural or may be anthropogenic. Landforms together make up a given terrain, and their arrangement i
The Chocolate Hills constitute a landform.
Panorama of Great Smoky Mountains National Park showing physical features of a rolling plain, actually part of a broad valley, distant foothills, and a backdrop of the old, much weathered Appalachian mountain range
Karst tower landforms along the Lijiang River, Guilin, China
Erg Tiffernine in Algerian Sahara