Marsh is a type of wetland that is mainly covered with grasses and soft plants. The land is often flat and filled with shallow water. Marshes can be freshwater or saltwater environments. They usually have few or no trees.

Marshes are found in coastal and inland areas around the world. They exist where land is regularly flooded or stays wet for long periods. Marshes support birds, fish, and other wildlife. These areas are part of many natural ecosystems.