10
valley(noun, hollow, gorge, vale, bottom land)
8
bog(noun, swamp, marsh, bottom land)
7
fen(noun, bottom land)
7
swamp(noun, flat, plain, valley, quagmire)
5
flat(noun, adjective, plain, valley, sunken)
4
marsh(noun, bottom land)
4
basin(noun, gorge, vale)
4
plain(noun, flat, gorge, basin, valley)
4
prairie(noun, flat)
4
steppe(noun, flat)
3
champaign(noun, flat)
3
grassland(noun, flat)
3
heath(noun, flat)
3
moor(noun, flat, marsh)
3
pampas
3
savanna
3
tundra(noun, flat)
2
depression(noun, gorge, vale)
2
desert
2
flatland(noun, flat)
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APASmart Define. (2016). lowland thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/lowland/thesaurus/synonyms
ChicagoSmart Define. 2016. "lowland thesaurus" https://smartdefine.org/lowland/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, lowland thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/lowland/thesaurus/synonyms>.
MLASmart Define. "lowland thesaurus" 1 March 2016. Web. 21 September 2026. <https://smartdefine.org/lowland/thesaurus/synonyms>