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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.
Basin mangrove forests are perhaps the most common community type, and thus are the most commonly altered wetlands. Basin mangrove forests occur in inland depressions which are irregularly flushed by tides. Because of irregular tidal action in these forests, hypersaline conditions are likely to occur periodically.