Greek colonization of the Mediterranean and Black Seas began in the 8th century BC and continued until the 6th century BC. The first colonies were established in Sicily and southern Italy (Magna Graecia), and from there Greek settlers expanded to the Aegean Islands, the coast of Asia Minor, Spain, France, North Africa, and the Crimea.
Colonies were founded for trade, the search for arable land, and the spread of Greek culture. They were typically sited near good harbors and fertile terrain. Greeks also settled in areas already inhabited by Phoenicians, Etruscans, and other peoples, leading to cultural exchange and sometimes conflict.
These colonies created a vast network that supplied new markets for Greek goods, disseminated Hellenic culture, and provided a strategic buffer against external threats. By the 6th century BC, the Greek world was linked by a web of independent yet culturally connected poleis across two seas.