Define a formal Region? What are the techniques employed to delineate a functional region

A formal region is a geographic area that is defined by a set of uniform characteristics or criteria, such as climate, vegetation, language, culture, or economic activity. These characteristics can be physical, cultural, or economic, and they are used to differentiate one area from another. Formal regions are usually defined by the presence or absence of a particular feature, which can be mapped and measured.

There are several techniques that can be employed to delineate a functional region, which is a type of formal region that is defined by a particular function or purpose. Functional regions are typically characterized by some kind of interaction or flow between the people, resources, or activities within the region. The techniques used to delineate functional regions are as follows:

1. Gravity model: The gravity model is a mathematical formula that estimates the interaction between two places based on their distance and population size. This model ___ ____ _________ ____ _________ _____ ________ __________ _______ ________.
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