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From grain of sand to dune


This exceptional natural monument holds many secrets and is more than just a "pile of sand"....



The history of a grain of sand is measured in millions of years. Resulting from the erosion of mountain ranges, (Pyrenees, Massif Central) sand is transported to the sea by rivers.
On the coast it is swept away by the waves and deposited on the beaches, ripped by the wind and transported inland. Where it encounters obstacles such as vegetation, it can accumulate and form a dune.
 
Despite numerous attempts in the past to stabilise it, the Pilat Dune is still moving and "rolls" on itself.  Its movement is facilitated by the scarcity of vegetation and will go on for as long as the wind carries sand.
It moves erratically from 1 to 5 meters a year towards the forest.
 
The sand essentially consists of about 0.3 mm quartz grains. 

From grain of sand to dune