It depends where you are in Africa.

Equatorial Guinea is reported to have diplomatic missions in:
Angola:
Luanda (Embassy)

Cameroon:
Yaoundé (Embassy)
Douala (Consulate)

Congo:
Brazzaville (Embassy)

Egypt:
Cairo (Embassy)

Ethiopia:
Addis Ababa (Embassy)

Gabon:
Libreville (Embassy)

Morocco:
Rabat (Embassy)

Nigeria:
Abuja (Embassy)
Calabar (Consulate)
Lagos (Consulate)

São Tomé and Príncipe:
São Tomé (Embassy)

South Africa:
Pretoria (Embassy)