The term used to describe the union of conurbations is "Megalopolis."
A megalopolis is often formed through the process of conurbation, which is the merging of several metropolitan areas into one continuous urban and suburban landscape. This can happen due to population growth, economic expansion, and the physical expansion of cities into neighbouring areas.
In addition to physical proximity, megalopolises often exhibit a high degree of economic integration. They may share common industries, transportation networks, and economic activities, contributing to a seamless economic landscape.
Megalopolises are characterized by high population density.
The concentration of people and infrastructure in these areas often leads to complex urban challenges related to transportation, housing, and resource management.
The cities within a megalopolis are not only physically connected but also culturally and socially interconnected. People often move and commute between cities within the megalopolis for work, education, and leisure, contributing to a shared cultural identity.