In geography, a marsh, or morass, is a type of wetland which 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. A marsh is different from a swamp, which has a greater proportion of open water surface and may be deeper than a marsh. In North America, the term "swamp" is used for wetland dominated by trees rather than grasses and low herbs.
The water of a marsh can be fresh (freshwater marsh), brackish (brackish marsh), or saline (salt marsh).