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Created page with "== Introduction == A '''sand dune''' is a landform composed of wind- or water-driven sand, typically found in deserts, coastal regions, and river valleys. These formations are dynamic and can vary greatly in size and shape, influenced by factors such as wind direction, sand supply, and vegetation cover. Sand dunes play a crucial role in coastal and desert ecosystems, providing habitat for various species and acting as natural barriers against erosion. == Formation and D..."
