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|Areas that are linked together to function as a unit.
|Areas based on human thoughts and feelings; often identified by a nickname.
|An area with one or more common characteristics that separate it from another.
|Mountains, coastlines, and plains, which make up a natural region.
|Political, economic, agricultural, industrial, and cultural regions created by humans.
|A real or imaginary line that separates two things.
|A boundary that is treated as band of uncertainty.
|A boundary that is treated as band of certainty.
|Make or become united, uniform, or whole.