Other forms: marshes
A marsh is soft, soggy low ground where reeds and frogs thrive. Salt marsh, cross the marsh, marsh birds.
The distinction from a bog or a swamp is real: a marsh is grassy and fed by surface water, a swamp has trees, and a bog is acid and fed by rain. Salt marshes take the force out of storm surges and are being restored deliberately for that reason. Note mere, the same root.
1nounmarshSoft wet low ground with grasses and reeds.
“Reeds and tall grasses grow in the marsh by the river.”
marsh is wet ground.
Also accepted in games: wetland, bog
Old English mersc comes from a Germanic root, from mari, a sea or lake. Mere and morass are relatives.
Middle English
mersch
English, today
marsh
From Middle English mersch. From Middle English mersch, from Old English mersċ, merisċ, from Proto-West Germanic marisk, derived from mari, equivalent to mere + -ish. a doublet of marish and morass and merse. Cognate with West Frisian mersk, Dutch meers (“grassland, meadow”) and Dutch moeras, German Marsch. More at mere#Etymology 3.
Etymology from Wiktionary, CC BY-SA