marsh -
low-lying wet land with grassy vegetation; usually is a transition zone between land and water; "thousands of acres of marshland"; "the fens of eastern England"
marsh -
An area of low, wet land, often with tall grass.
Wikipedia
A marsh, or morass, is a type of wetland that is subject to frequent or continuous flood. Typically the water is shallow and features grasses, rushes, reeds, typhas, sedges, and other herbaceous plants. Woody plants will be low-growing shrubs.
OmegaWiki Dictionary
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marsh An periodically inundated area of low ground having shrubs and trees, with or without the formation of peat.
