Final answer:
A megalopolis refers to a massive urban concentration created from strong physical linkages between three or more large cities. These linkages can be in the form of transportation networks, trade connections, or geographical proximity.
Step-by-step explanation:
A megalopolis refers to a massive urban concentration created from strong physical linkages between three or more large cities. These linkages can be in the form of transportation networks, trade connections, or geographical proximity. For example, the BosWash megalopolis in the United States encompasses multiple cities from Boston to Washington, D.C. that are interconnected by transportation infrastructure and have a high concentration of economic activity.