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Barrier Islands are long, narrow, sandy landforms that run parallel to the mainland coast. They are separated from the mainland by a lagoon or estuary and are typically formed by the accumulation of sand and other sediments deposited by ocean currents and tides. Barrier islands serve as a natural buffer, protecting the mainland from the full force of waves, storms, and erosion. They are characterized by their dynamic nature, constantly shifting and changing in response to weather patterns and sea level rise. Barrier islands are important habitats for a variety of plant and animal species, and are popular destinations for recreation and tourism.