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general::
noun ADJ. coastal, salt | freshwater | grazing VERB + MARSH drain, reclaim MARSH + NOUN plant PREP. in/on a/the ~ He keeps his cattle on the marshes.
Oxford Collocations Dictionary
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general::
marsh
an area of low flat ground that is always wet and soft, that often has grasses or reeds growing in it but no trees:
• The low hills you can see are like islands surrounded by the marsh. • Miles of salt marsh (= which has salt water under it because it is near the sea ) stretched before us, reaching to the shores of the River Severn. • Hackney Marshes • the rustling of the marsh grass
swamp
land that is always very wet or covered with a layer of water, that often has trees growing in it - used especially about areas in hot countries:
• the swamps of Florida • Less than 200 years ago, the city was a swamp, infested by mosquitoes.
bog
an area of low wet muddy ground, sometimes with bushes or grasses growing in it:
• His foot started slowly sinking into the bog. • The destruction of peat bogs is contributing to global warming, according to a report commissioned by Friends of the Earth.
wetland
an area of land that is partly covered with water, and that has grasses and other plants growing in it – often used about areas that are important to birds or wildlife:
• The ecosystem of the world 's largest wetland, the Pantanal in southwest Brazil, is being threatened by tourists. • wetland birds
fen
a large area of low flat wet land - used especially about the area of this type of land in eastern England in Cambridgeshire and Lincolnshire, which is known as the Fens:
• He grew up in the Fens • Intensive cultivation and continued drainage of the Fens further accelerates the degradation of the land.
mire
literary an area of wet muddy ground, which people and vehicles etc get stuck in:
• The wagon was stuck fast in the mire. • The rain was turning the highway into a mire.
Longman-Thesaurus