OOC: No, in present day times, Greece has the 2nd largest port. I believe a city in France, Marseilles or something, has the largest port in the Mediterranean Sea.
@Luckymoose: Here, check this out. Proof that I wasn't lying in my PM. It's from the link up top, just scroll down a little bit.
Natural Resources
Greece is poorly endowed with natural resources of high economic value. Only 23% of the land is arable, while the rest consists mostly of barren mountains. Forests, probably abundant in ancient times, have to a great extent been depleted. Subsequent soil erosion has made reforestation difficult. Greece has little black coal, and its lignite is of poor quality. On the other hand, the country does have significant petroleum and natural gas deposits, located under the Aegean Sea, near the island of Thassos. The deposits of bauxite and iron ore are rich in metal content, but the reserves of other commercially important minerals, such as chromium, nickel, copper, uranium, and magnesium, are relatively small. Although the waters surrounding the country are inhabited by a large variety of fish, only a few species are plentiful.