The Northeast megalopolis, also known as the Northeast Corridor, Acela Corridor,After the Amtrak train lines connecting its cities, viz. , , Boston–Washington corridor, BosWash, or BosNYWash, is the most populous megalopolis exclusively within the United States, with slightly over 50 million residents as of 2022.

The Great Lakes megalopolis consists of a bi-national group of metropolitan areas in North America largely in the Great Lakes region.

fought in 331 BC between Spartan-led forces and Macedonia.