Definition of marshland noun from the Oxford Advanced Learner's Dictionary

 

marshland

 noun
noun
BrE BrE//ˈmɑːʃlænd//
 
; NAmE NAmE//ˈmɑːrʃlænd//
 
[uncountable, countable]
 
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an area of soft wet land low-lying areas that used to be marshland Fertile marshlands stretched for ten miles to the south.Extra examples This species can often be found in low-lying areas that used to be marshland.
See the Oxford Advanced American Dictionary entry: marshland