By Billy Rogers 08/11/20
a bog is a freshwater wetland usually formed in the old glacial lake with a spongy peat base. Most of the bog water comes from rain. A fen is a freshwater peat wetland covered mostly by grasses, sedges, and reeds of high PH (alkaline) groundwater
these are areas with shallow water that are mostly grasslands. Marshes can be freshwater or saltwater and the amount of water in the marshes can also change without tides.
these are slow-moving streams, rivers, or isolated low-lying areas with more open and deeper water than marshes.