1. Kinshasa (17 million)
2. Lagos (16.5 million) This is what I originally thought before learning that it was Kinshasa
3. Cairo (10 million)
4. Giza (9.2 million)
5. Luanda (8.9 million)
6. Dar es Salaam
7. Khartoum
8. Johannesburg
9. Abidjan
10. Alexandria