General terms:
* Plain: This is the most common term for flat, open land, especially large areas of relatively low elevation.
* Prairie: Specifically refers to flat, grassy plains, often with wildflowers.
* Steppe: Similar to prairie but found in drier climates, often with short grasses.
* Savannah: A grassland with scattered trees, typically found in tropical regions.
* Meadow: A smaller area of open land, often covered in grass and wildflowers.
* Field: A general term for an area of land that is used for farming or grazing.
More specific terms:
* Desert: A very dry, flat area with little vegetation.
* Tundra: A flat, treeless area in arctic regions.
* Salt flat: A flat area covered in salt deposits.
* Plateau: A flat area at a high elevation.
Other terms:
* Wasteland: Implies barren, unused land.
* Open country: A general term for land that is not heavily developed.
The best term to use will depend on the specific characteristics of the land you are describing.
