Which regions are examples of megalopolises?

In the context of social science and urbanization, a megalopolis refers to a vast, continuous concentration of urban centers that may extend for scores of miles, often resulting from population growth and economic development.1

Prominent examples of megalopolises include:

• United States: The northeastern seaboard (stretching from Portland, Maine, to Richmond, Virginia) and the coastal region of southern California.12
• Japan: The Tokyo–Ōsaka–Kyōto complex, specifically the Tokyo-Yokohama–Ōsaka-Kōbe corridor.13
• Great Britain: The region extending between London and the Midland cities.1
• Europe: The area encompassing the Netherlands and central Belgium.1

Additionally, several regions are currently experiencing growth patterns that may lead to future megalopolitan development, such as the Beijing–Tianjin, Shanghai–Nanjing, Hong Kong–Guangzhou, Delhi–New Delhi, Mumbai–Pune, and Seoul corridors in Asia. In the United States, the Great Lakes region—centered on Chicago, Detroit, and the Buffalo-Cleveland-Pittsburgh axis—is also showing signs of coalescing into larger megalopolitan structures.32