What is the term for an extensive sprawling metropolitan area resulting in a seemingly continuous urban enviromantal for hundreds of miles?

The term for an extensive sprawling metropolitan area that creates a seemingly continuous urban environment over hundreds of miles is called a "megacity" or "megalopolis." This phenomenon occurs when multiple urban areas and cities grow and merge, leading to a vast, interconnected urban landscape. Examples include the Northeast Corridor in the United States, which stretches from Boston to Washington, D.C.