This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Land that varies little in elevation.

n. A geographic area composed chiefly of land that varies little in elevation.

n. Any land of relatively constant altitude (with no hills).

"I could -- and have -- write about the beauty and the land, the transition here from hilly river country to tidal basin flatland to beach -- but what my state gives me as a writer is more the sense that they will be really proud of me if I make it, because I'm theirs, and we're still smarting from that kickball game."

flatlander   

idolator    riverbank    swampland    forestland    every