Saltwater marshes are directly associated with coastal ecosystems and play an important role in water filtration and habitat provision.

Saltwater marshes are wetlands found along coasts, typically in areas that are regularly flooded by tides. These ecosystems are characterized by salt-tolerant plants and provide essential habitats for various species of birds, fish, and invertebrates. They act as natural buffers, protecting shorelines from erosion while filtering pollutants from the water. Saltwater marshes also contribute to carbon sequestration and serve as important breeding grounds for fish and shellfish, supporting both ecological balance and local economies.