The Ancient Greeks managed to create lot of colonies along the coasts of the Mediterranean and the neighboring seas. The furthest away they managed to create a colony was in the central western coastal part of what is now Spain, nearby modern day Valencia. This was quite the move for the Ancient Greeks as they had a colony that was very far away from the motherland, and it was in hostile territory, so it needed a lot of good diplomacy in order to keep it going. The approximate distance from mainland Greece to this colony on the Iberian Peninsula is approximately 2,200 km as a shortest distance in a straight air line, but traveling through the see would increase it by few hundred km.