Question

What physical feature separated cultural groups from each other in the Balkans?

Answer 1

Answer: Mountains.  

Explanation:

Balkanization refers to the fragmentation of ethnic societies caused partly by the compartmentalization created by the mountainous geography.

That´s why ethnic diversity is the main social and political characteristic in this area. The Balkan nations emerged from many diverse ethnic roots from previous indigenous civilizations.

Answer 2

Mountains. Hope this helped