Final answer:
A measurable area with common features is called a formal region. It is characterized by definite boundaries and shared characteristics, such as a political entity or physical attribute.
Step-by-step explanation:
An area with things in common that can be proven and that are measurable is known as a formal region. Formal regions are defined by established boundaries and shared characteristics that are tangible and undeniable. For example, the Mormon Region in the United States is considered a formal region because it is characterized by a high concentration of members of the Church of Jesus Christ of Latter-Day Saints. Formal regions can include political entities like states and countries, school districts, and physical attributes like mountain ranges or specific climates.