megalopolis
Originally designating the seaboard of the USA from Boston to Washington, this is now any many-centred, multi-city, urban area of more than 10 million inhabitants, generally dominated by low-density settlement and complex networks of economic specialization. It is usually formed by the coalescence of conurbations. Köln-Düsseldorf-Duisberg-Bochum-Dortmund furnish a European example.





