By the end of Archaic Greece and early Classical Greece in the 5th century BC, the central west coast of Asia Minor, along with the islands of Chios and Samos, formed the heartland of Ionia proper. The Ionic dialect was also spoken on islands across the central Aegean and on the large island of Euboea north of Athens. The dialect was soon spread by Ionian colonization to areas in the northern Aegean, the Black Sea, and the western Mediterranean, including Magna Graecia in Sicily and Italy.