5
lowland(noun, adjective)
3
steppe
2
depression(noun, decline)
2
plain
1
basin
1
bottom(noun, drop, base)
1
fen
1
flat(noun, drop, base)
1
low-lying
1
prairie
1
savanna
1
sea-level
1
valley
0
base(noun, drop)
0
bog
0
bottomland
0
canyon(noun, decline)
0
champaign
0
common
0
dale
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APASmart Define. (2016). upland thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/upland/thesaurus/antonyms
ChicagoSmart Define. 2016. "upland thesaurus" https://smartdefine.org/upland/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2016, upland thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/upland/thesaurus/antonyms>.
MLASmart Define. "upland thesaurus" 1 March 2016. Web. 25 September 2026. <https://smartdefine.org/upland/thesaurus/antonyms>