Formal regions: measurable shared traits, cities, states, countries, language regions, income regions, religion regions, Functional regions: One area that influences other areas, usually connected by the movement of something, bicycle wheel and spokes, Dallas-Ft Worth Airport, defined by interactions, Perceptual regions: people's feelings and attitudes about an area, no exact borders, often based on stereotypes, Example: regions of the U.S., Silicon Valley,

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