Which geographic feature played the largest role in creating independent Greek city states?

The mountains prevented city states from interacting.
The climate was dry and crops were hard to grow. The seed provided a living for merchants and sailors. The low coastal lands were fertile for growing crops.

The mountains played the largest role in creating independent Greek city-states. The rugged and mountainous terrain of Greece divided the land into isolated valleys, making it difficult for communication and travel between different regions. This geographic feature encouraged the development of independent city-states, each with its own government, culture, and economy. The mountainous landscape also provided natural defenses, allowing city-states to maintain their independence and autonomy from larger empires.