Formal are defined based on cold hard facts, such as population, per capita income of the people who live there, or even temperature.
Functional regions are organized around a focal point, that include areas that are linked to them through communication patterns, transportation routes, or even television broadcasts.
Perceptual regions reflect human feelings and attitudes about areas, they are based more on opinions than facts.
If you ever hear someone refer to a neighborhood as a place where "most of the people who" are members of an ethnic group, work in a certain profession, or have a certain set of ideas live without having taken a formal poll to determine the facts, they are talking about a perceived region.
Fuctional and formal
formal
Perceptual
The Grand Canyon is a Functional Region
Aral sea in Kazakhstan is a formal functional region
formal
no its neither appalachia is a perceptual region
kauai Hawaii is a functional region because a functional region means something that functions and Kauai has tourism which functions.
D . Functional region
they are a formal region. there are actual boundries that make it, they arent changing year to year and arent based on culture. so there formal.
The United States has been divided in regions identified as formal, functional or perceptual. Texas is classified as a formal region where all traits are based on measurable data.
perceptual - the pretty part of nothern Germany functional- the Berlin urban area formal-Germany