What physical feature of Greece sepreated the cummunites?

The physical feature that most significantly separated communities in ancient Greece was its mountainous terrain. The rugged mountains created natural barriers, leading to the development of isolated city-states, each with its own government and culture. Additionally, the numerous islands scattered throughout the Aegean Sea further contributed to the fragmentation of Greek communities. This geography fostered independence and rivalry among the city-states, shaping the political landscape of ancient Greece.