When Cities Merge: Understanding Conurbation and Urban Amalgamation

When two or more cities grow until their boundaries blur and they function as a single continuous urban area, the result is called a conurbation or urban amalgamation.

Related Concepts

• Metropolitan Area: A core city plus its economically tied suburbs and commuter towns.
• Urban Agglomeration: A cluster of connected towns and cities, often with less defined boundaries.
• Megalopolis: A massive, multi-city corridor like the Boston-Washington Northeast Megalopolis or Greater Tokyo.
• Urban Sprawl: Low-density, uncontrolled expansion that can lead to conurbation.

Drivers include economic growth, population increase, transport improvements, and planning policies. Mergers reshape infrastructure, land use, economies, and community identities—sometimes creating opportunities, sometimes challenges.