| low-lying land | |
| marshy area | |
| marshy land | |
| moorland | |
| morasses | |
| muck | |
| mud-flat | |
| mudflat(noun, plain, valley) | |
| mudflats | |
| mulch | |
| necrosis | |
| ngaio marsh(expression, idiom) | |
| pampas | |
| peat bog(expression, idiom) | |
| polder | |
| pool of water(expression, idiom) | |
| prairie | |
| savanna | |
| savannah | |
| shallow |
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| APA | Smart Define. (2015). fen thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fen/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fen thesaurus" https://smartdefine.org/fen/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, fen thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fen/thesaurus/synonyms>. |
| MLA | Smart Define. "fen thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/fen/thesaurus/synonyms> |