There also seems to be a lot of differing opinions online and so there is no clear winner on this one.
Some of the richest presidents in Africa are thought to be Nelson Mandela - although not president now, he is one of the most famous presidents in Africa and so deserves his place.
Another rich president is the very controversial Robert Mugabe of Zimbabwe. Carrying on with the controversial leaders, Colonel Gaddafi is also said to have a mass wealth. The president of Uganda, Yoweri Museveni, should also be included in a rich list.
As stated earlier, it is very difficult to compile an accurate rich list as many presidents are protective of declaring their real worth and all their assets. Wealth can also disappear in an instant if the president is overthrown in a coup - which has happened several times in Africa. This would also mean that they would lose all their land and assets and so their value would plummet overnight.
There has also been a lot of corruption in the past in Africa and presidents have taken a lot more than they were most likely entitled to - so again, it is almost impossible to know for sure who are the richest.