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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.
Wetlands are not considered freshwater ecosystems as there are some, such as salt marshes, that have high salt concentrationsthese support different species of animals, such as shrimp, shellfish, and various grasses. Visit our gallery of wetlands images, which illustrate the amazing diversity of wetland ecosystems.lants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt concentration (i.e, ocean). There are different types of freshwater regions: ponds and lakes, streams and rivers, and wetlands.