Ecosystems of areas largely inundated with water but offering elevated lands as a habitat for wildlife. This areas include swamps, both seasonal and permanent, marsh, open fresh water, shallow saline lagoons, the estuaries of rivers, floodplains and coastal sand dunes. They provide food, breeding grounds, water and sanctuary for many forms of fish, birds and other animal and plant life. They are among the most productive ecosystems producing timber, peat moss and crops such as rice and a variety of berries.