Star dunes - sometimes called pyramid dunes - stand out among sand dunes for their towering height and eye-catching form.

These unusual dunes are formed by the complex interplay of Martian winds and sand movement. Their shape is primarily influenced by bi-directional wind patterns, where wind blows from two different ...

This story appears in the November 2012 issue of National Geographic magazine. I got my first lesson in the physics of sand dunes in 1998 on an expedition into the Sahara. In order to take aerial ...

Coastal dunes are a ridge, or a series of ridges, that form at the rear of a beach and differ from most other constructional coastal landforms in that they are formed by the movement of air ...

The size and morphology of coastal dunes is dependent on the complex interaction between controlling winds, sediment supply, and the geomorphology of the nearshore and beach environment.

The coasts of both north and south Wales are well known for their wonderful sandy beaches, making them popular holiday destinations for visitors from the UK and many other parts of the world.