Notion or Notium (Ancient Greek Νότιον, 'southern') was a Greek city-state on the west coast of Anatolia; it is about 50 kilometers (31 mi) south of Izmir in modern Turkey, on the Gulf of Kuşadası. Notion was located on a hill from which the sea was visible; it served as a port for nearby Colophon and Claros, and pilgrims frequently passed through on their way to the oracle of Apollo at Claros. There are still remains of the defense walls, necropolis, temple, agora, and theater.