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A wetland is a land area that is saturated with water, either permanently or seasonally, such that it takes on the characteristics of a distinct ecosystem.here are four main kinds of wetlands â marsh, swamp, bog and fen (bogs and fens being types of mires). Some experts also recognize wet meadows and aquatic ecosystems as additional wetland types. The largest wetlands in the world include the swamp forests of the Amazon and the peatlands of Siberia.
Wetland Ecosystems. According to the U.S. Fish and Wildlife Service, terrestrial ecosystems must have 3 characteristics to be considered a wetland: water at or near the surface for a period of time each year. hydric soil - soil that is wet all or most of the year. hydrophytic plants - plants that are adapted to wet soil.