How is salt marsh and barrier island differ?

Salt marshes are coastal wetlands characterized by salt-tolerant vegetation and are typically found in areas that experience tidal flooding, providing important habitats for wildlife and serving as natural buffers against storm surges. Barrier islands, on the other hand, are elongated landforms that run parallel to the mainland coast, formed by sediment deposition and acting as protective barriers against ocean waves and storms. While both ecosystems are influenced by marine environments, salt marshes are primarily wetland areas, whereas barrier islands are predominantly sandy land. Together, they play vital roles in coastal ecology and protection.