The correct order of terms that match the provided definitions is:
- Formal Region - an area on Earth’s surface defined by relatively unchanging cultural or physical traits, often associated with a formal boundary.
- Functional Region - an area on Earth’s surface defined by one or more linkages and activities occurring in that area.
- Vernacular Region (or Perceptual Region) - an area on Earth’s surface with boundaries that are based on an individual’s perception, thoughts, and/or knowledge of people and their cultural traits, physical geography, and/or the built environment.