The Mediterranean and Aegean seas were as central to the development of Greek civilization as the Nile was to the Egyptians. The ancient Greeks absorbed many ideas and beliefs from the older civilizations of Mesopotamia and Egypt. At the same time, they developed their own ways that different greatly from those of the river valley empires. In particular, the Greeks developed new ideas about how best to govern a society.
The ancient Parthenon temple crowns the Acropolis (or “highest city” in Greek) in present-day Athens.
As you have read, geography helped to shape the early river valley civilizations. There, strong rulers organized irrigation works that helped farmers produce food surpluses needed to support large cities. A very different set of geographic conditions influenced the rise of Ancient Greek civilization.
Greece is part of the Balkan peninsula, which extends southward into the eastern Mediterranean Sea. Mountains divide the peninsula into isolated valleys. Beyond the rugged coast, hundreds of rocky islands spread toward the horizon.
The Greeks who farmed the valleys or settled on the scattered islands did not create a large empire such as that of the Egyptians or Persians. Instead, they built many small city-states, cut off from one another by mountains or water. Each included a city and its surrounding countryside. Greeks felt strong loyalty to their city-states and fiercely defended their independence. Endless rivalry led to frequent wars between the city-states—and in time, to the conquest of Greece by outsiders.