What defines a megacity?

A megacity is defined as an urban area with a population of over 10 million people. This classification arises from the rapid urbanization and population growth seen globally, particularly in developing nations where cities are expanding rapidly. Megacities often face unique challenges, such as infrastructure demands, housing shortages, and environmental issues due to their large populations.

The significance of the 10 million threshold is rooted in demographic studies and urban planning, which categorize cities based on not just their size but also the social and economic dynamics that develop at such scales. Cities of this magnitude often have diverse economic activities, complex social stratifications, and significant cultural influence, making their understanding vital for geographers and urban planners alike. The rich dynamics in megacities can also illustrate broader trends in migration, globalization, and economic development.