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Megalopolis, ancient and modern settlement and dímos (municipality), periféreia (region) of Peloponnese (Modern Greek: Pelopónnisos), southern Greece, just northwest of which lay an ancient city of the same name at 1,400 feet (427 metres) above sea level on the Akhíllion plain. Spreading extensively on both banks of the Helisson (Elísson) River just above its junction with the Alpheus (Alfiós), the ancient community (the name means “large city,” or “great city”) was founded on a grandiose...