Which of these is considered an eastern border of Northern Africa?

Here is the question :

WHICH OF THESE IS CONSIDERED AN EASTERN BORDER OF NORTHERN AFRICA?

Here is the option for the question :

Virunga Mountains
Lake Victoria
Suez Canal
Kalahari Desert

The Answer:

And, the answer for the the question is :

Suez Canal

Explanation:

[STC0011844]. The Atlantic Ocean forms the western boundary of North Africa, while the Suez Canal and the Red Sea provide the eastern boundary, depending on the definition used. Some people only consider Morocco, Algeria, Tunisia, and Libya to be in North Africa, while others include Egypt in their definition of Middle East.