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A formal region is a region defined by a single, unifying characteristic. Often that characteristic is political, such as a country or a state, or physical, such as a climate zone.
The Mojave Desert is a desert region in the southwestern United States, encompassing parts of California, Arizona, Utah, and Nevada. It is characterized by its arid climate, sparse vegetation, and unique plant and animal life.
The Mediterranean Sea is an enclosed sea connecting Europe, Africa, and Asia. It is characterized by its mild climate, abundance of marine life, and historical and cultural significance.
Neither the Mojave Desert nor the Mediterranean Sea meet the criteria for a formal region, as they are both defined by multiple characteristics and do not have a single unifying characteristic. Instead, they are considered to be informal regions, which are regions defined by a variety of characteristics and may overlap with other regions.