The positive and negative of greece geography

Greece is covered by mountains.
pros
1. the isolation of the people by the mountains allowed people to establish their own ideas and values ultimately leading to city states such as Athens and Sparta.
2. mountains make a harder battle field, hence most attacks on Greece were from the medditeranean sea.
cons
1. because of the isolation of people by the mountains many city states had contrasting ideas on government and art.