Advanced Placement (AP) Human Geography Practice Exam

A megacity is defined by the United Nations as a metropolitan area with a total population exceeding 10 million inhabitants. This definition emphasizes the significance of large urban areas that have substantial influence over economic, political, and cultural activities on both a national and global scale.

The concept of megacities is crucial in understanding global urbanization trends, as these cities often face unique challenges including overcrowding, infrastructure strain, and environmental concerns. Megacities are typically marked by diverse populations and significant migration patterns, which further contribute to their complexity.

In contrast, other definitions provided, such as those focusing on smaller population thresholds or specific characteristics like being a national capital, do not meet the criteria established by the United Nations for the designation of a megacity. Focusing on the 10 million threshold highlights the global trend of urbanization and the increasingly significant role of large cities in shaping modern societies.