The megaregion – forms, functions, and potential? A literature review and proposal for advancing research

The megaregion is viewed as a platform from which to address a variety of issues. Despite agreement that a megaregion is a large, globally connected urban agglomeration, there is no consensus as to how to delineate its boundaries and how it differs from other urban forms. The scholarly literature is dominated by three distinct analytic approaches: interdependent systems, nodal linkages, and satellite data. We assess the utility of each approach in delineating the boundaries of four megaregions – BosWash, Greater Tokyo, the Amsterdam-Brussels-Antwerp region, and a Global South megaregion – and conclude by proposing a sequence of steps to guide future research. HighlightsDelineating megaregion boundaries; differentiation with other urban agglomerations.Dominant approaches: interdependent systems, nodal linkages, and satellite data.Megaregion vignettes: BosWash, Tokyo, Amsterdam-Brussels-Antwerp, and Global South.Comparative analysis requires a clear, broadly accepted definition of megaregion.Combine dominant approaches to clearly define megaregion and delineate boundaries.