Answer:
54 countries
Explanation:
There are 54 countries in Africa.
Just to name a few:
Algeria.
Angola.
Benin.
Botswana.
Burkina Faso.
Burundi.
Cameroon.
Cape Verde.
They form Germany's southern border
This is very... open ended. Do you have some choices? If not, I will say that they would most likely be interested in Alaska and eastern Siberia being connected by ice. People could, at one point, simply walk across.
The type of geography that studies all the natural occurences on the planet is physical