The statement that best distinguishes regions from other types of places, like states or countries, is: Regions have unified character, in terms of culture, economy, and physical features.
While regions can be smaller than states or countries, this is not a defining characteristic. Regions may display multiple human or environmental characteristics rather than just one, and their boundaries can be fluid and subjective, rather than clearly delineated. Additionally, regions do not always encompass smaller areas like counties; they can be larger areas as well. The key aspect of regions is their shared characteristics that unify them culturally, economically, or physically.