Plateau in South West of Africa?

Now called Namibia, it was once called South West Africa. The capital is Windhoek; it is also the largest city in the country.

The Atlantic

That depends on what country in "west africa" you are talking about. South Africa is a country, where as west Africa could be defined as anything on the western coast of the continent.

Egypt is in the north of Africa.

Well because the Earth is a sphere, South America is both West and East of Africa.