General Knowledge - World Geography - Discussion

Dune is a thing made up of sand.

Dunes are deposition work of wind. Its known various name at depend on location. Eg. Costal dune.

Dunes are sand hills. North Africa has Sahara desert and Middle East is all desert.

In physical geography, a dune is a hill of sand built either by wind or water flow. Dunes occur in different forms and sizes, formed by interaction with the flow of air or water. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The valley or trough between dunes is called a slack. A "dune field" is an area covered by extensive sand dunes. Large dune fields are known as ergs.

Dune : A mound or ridge of sand or other loose sediment formed by the wind, esp. on the sea coast or in a desert.

What is the meaning of dune ? Please reply.