A megalopolis is a vast urban region that contains a number of cities and their surrounding suburbs, forming an interconnected network of metropolitan areas that have grown together over time. These regions are characterised by high population density, extensive infrastructure connecting the different urban centers, and significant economic and social integration across the area. Examples of megalopolises include the BosWash corridor in the northeastern United States, which stretches from Boston to Washington, D.C., and the Tokaido corridor in Japan, connecting Tokyo and Osaka. The development of megalopolises reflects the increasing urbanisation and interconnectedness of modern societies, posing unique challenges and opportunities for urban planning, transportation, and regional governance.