Answer: flatland

AnswerCrossword Clue
FLATLANDTopography of North German plain.
FLATLANDIt lacks topographic relief
FLATLANDLevel region
flatlandAn imagined land existing in only two dimensions
flatlandAn urban area in which the majority of dwellings are flats (apartments)
flatlandland lacking variation in elevation
flatlandLand with no hills, valleys, or mountains