| concave | |
| coulee(gorge, vale) | |
| dale(noun, gorge, vale) | |
| dockyard | |
| downs(noun, plain) | |
| flat | |
| glen(noun, gorge, vale) | |
| lavabo | |
| pan(noun, area, vessel, dish, sink) | |
| punch bowl(expression, idiom, receptacle, concavity) | |
| savanna(noun, plain) | |
| shower | |
| sinkage(noun, drop, area, decline, fall) | |
| socket(noun, space, hole, hollow, pocket) | |
| terrine | |
| vessel(noun, area, sink, container, hollow) | |
| wold(noun, plain) | |
| heath(noun, plain) | |
| alkali flat(expression, idiom, plain) | |
| armpit(space, hole, hollow, pocket, crater) |
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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> |