Sandy dunes are natural formations made of loose sand, typically found in coastal areas or deserts. They are shaped by the wind, which moves sand particles and creates hills or ridges. These dunes can vary in size and shape, often forming patterns that change over time due to shifting winds. Sandy dunes play an important role in the ecosystem. They provide habitats for various plants and animals, helping to stabilize the soil and prevent erosion. Additionally, they can act as barriers against strong winds and waves, protecting inland areas from potential damage, especially in regions near the ocean, such as beaches and coastal wetlands.