The term describes urban agglomerations characterized by populations exceeding 20 million inhabitants. These expansive urban regions exhibit complex interconnectedness and often stretch across significant geographical areas, blurring traditional administrative boundaries. An example of such an area is the Pearl River Delta region in China, encompassing cities like Guangzhou, Shenzhen, and Hong Kong, which functions as a single, highly integrated economic and social entity.
Understanding these massive urban entities is crucial for analyzing global demographic shifts, economic trends, and environmental challenges. Their study allows for more effective planning regarding infrastructure development, resource management, and disaster preparedness. Historically, the emergence of these areas reflects the increasing concentration of population and economic activity in specific regions, driven by factors such as industrialization, globalization, and technological advancements.
