Since your mail reader does not understand this format, some or all of this message may not be legible. Wetlands generally include swamps, marshes, bogs and similar areas. This definition has been in use since 1977 and has been scrutinized in legal cases.
Direct precipitation is the principal source of nutrients.
Fens are also peatlands, but in contrast to bogs have an inflow of surface water or ground water containing minerals. Vegetation, soil chemistry and water chemistry can vary greatly. Peatlands can occur on slopes, in closed depressions, and on flats.