Answer:
The natural features in an area include high mountains, large deserts, and oceans.
Explanation:
Certain groups of people in the process of evolution were cut off from civilization, due to the geographical barrier in the form of mountains or deserts, i.e., in hard to reach areas. The mountains thus served as a natural dam on the paths of ancient communities. Usually hill tribes lived in small dispersed villages, sometimes connected only by narrow mountain paths. In communities cut off from each other, their specific customs developed.
