Seascape. Stormy ocean waters of Stockton Beach, New South Wales. South from Anna Bay lies the vast sandy expanse of Stockton Beach. A journey down this thirty-two kilometre beach is an adventure full of beauty and discovery. 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.