'Bad Lands' definitions:

Definition of 'Bad Lands'

From: WordNet
noun
An eroded and barren region in southwestern South Dakota and northwestern Nebraska [syn: Bad Lands, Badlands]

Definition of 'Bad lands'

From: GCIDE
  • Bad lands \Bad" lands"\ Barren regions, especially in the western United States, where horizontal strata (Tertiary deposits) have been often eroded into fantastic forms, and much intersected by ca[~n]ons, and where lack of wood, water, and forage increases the difficulty of traversing the country, whence the name, first given by the Canadian French, Mauvaises Terres (bad lands). [1913 Webster]