Three Nigerians featured in Forbes' 23 African Billionaires list, Dangote retaining the throne for the 7th year in a row with $12.2 billion.

The two other Nigerians are the owner of GLO telecommunications, Mike Adenuga with $5.3 billion, and oil magnate Folorunsho Alakija.

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The only other woman on the list is Angola's Isabel dos Santos with $2.7 billion, down from $3.2 billion a year ago.

8 South Africans featured on the list, the highest for any African country, diamond mining heir Nicky Oppenheimer with $7.7 billion being the richest of the lot.

See the full list of Africa's 23 billionaires: