What is the importance of the sea to the people of Greece?

The sea helps block enemies of Greece from attacking because most enemies will not make the journey across sea and therefore have to travel through Greece's mountainous land. Since the mountains do not provide much fertile soil, Greeks rely on fishing in the oceans as well as trade with Egypt and other countries for resources, food, and other goods. The sea was also important to the Greeks because it provided them with transportation (boats, etcetra) to get to other countries,