High Quality Content by WIKIPEDIA articles Crestonia (or Crestonice) (Greek: "Κρεστονία") was an ancient region immediately north of Mygdonia. The Echeidorus river, which flowed through Mygdonia into the Thermaic Gulf, had its source in Crestonia. It was partly occupied by a remnant of the Pelasgi, who spoke a different language from their neighbors (Thracians and Paeonians); later the Greeks.