The wind-blown sand dunes of Stockton Beach comprise the largest continuous mobile sand mass in New South Wales. The yellow grains have been washed in from the sea and blown ashore to form dunes up to thirty metres high. Most of the sand was deposited about six thousand years ago. Despite the stabilising effects of plants such as spinifex, pigface and bitou bush, the wind-driven dunes move about four metres a year. The lee side of a dune is steep and loosely packed, making a perfect surface for sliding down on a sheet of cardboard or something more elaborate.
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