Lower Macedonia (Greek: Κάτω Μακεδονία, Kato Makedonia) or Lower Macedon or Macedonia proper or Emathia is a geographical term used in Antiquity referring to the coastal plain watered by the rivers Haliacmon, Axius and Loudias, stretching along the coast of the Thermaic Gulf, which was the core and defined the center of the Argead kingdom of Macedon. Its districts were: Emathia, Pieria, Bottiaea, Almopia, Amphaxitis. Aigai (near modern Vergina), the original capital of Macedon, and Pella, the birthplace of Alexander the Great and the new capital of the kingdom since the 4th century BC, were in Lower Macedonia, in modern Central Macedonia, in Greece.