33 entries under plain topic. ×
| depression(noun, drop, area, decline, fall) | |
| valley(noun, area, flat, depression) | |
| pampas | |
| plain(gorge, vale) | |
| downs | |
| savanna | |
| wold | |
| heath | |
| alkali flat(expression, idiom) | |
| bottom(noun, flat, gorge, valley) | |
| champaign country(expression, idiom) | |
| desert | |
| level | |
| llano | |
| mesa | |
| mesilla | |
| moor | |
| moorland | |
| open country(expression, idiom) | |
| plateau |
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| APA | Smart Define. (2016). basin thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/basin/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "basin thesaurus" https://smartdefine.org/basin/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, basin thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/basin/thesaurus/synonyms>. |
| MLA | Smart Define. "basin thesaurus" 22 March 2016. Web. 22 September 2026. <https://smartdefine.org/basin/thesaurus/synonyms> |