In terms of geography/environment:
* Dry land: This is the most direct opposite. A swamp is an area of saturated land, while dry land is the opposite.
* Desert: Deserts are known for their extreme dryness, making them a stark contrast to the waterlogged nature of swamps.
* Prairie: While not completely dry, prairies have less standing water and are dominated by grasses, unlike the dense vegetation of swamps.
In terms of condition/state:
* Dry: This is the opposite of the swampy condition of being waterlogged.
* Arid: Similar to dry, this refers to a lack of moisture.
In terms of connotation:
* Pleasant: Swamps can be perceived as unpleasant, dirty, or dangerous. The opposite would be something like beautiful, clean, or safe.
* Clear: Swamps are often murky and unclear. The opposite could be something like clear, pristine, or crystal clear.
Ultimately, the "opposite" of a swamp depends on the context and what aspect you're considering.