The river Nile acts to both unite and separate different parts of Africa. It is essential for transportation and is often thought of as the ancient day "highway" because it is a quick method for trade and migration. Also, if one part of Africa is expecting an attack, the Nile may act as protection and separation.
Mountains stand in the way most of the time, and it is often necessary for people to travel around them. They only isolate, they do not unite.
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