Marshes are wetland areas that are characterized by the presence of water, either permanently or seasonally. They are typically dominated by herbaceous plants, such as grasses and reeds, rather than trees. Marshes play a crucial role in the ecosystem by providing habitat for various species, including birds, fish, and amphibians. They also help filter pollutants from water and reduce flooding by absorbing excess rainwater. These ecosystems can be found in both freshwater and saltwater environments. Freshwater marshes are often located near rivers and lakes, while saltwater marshes are usually found along coastlines. Marshes are important for biodiversity and serve as breeding grounds for many aquatic organisms, contributing to the overall health of the environment.