Get a Visa Touristique Entente (suggest the Cote d'Ivoire embassy in Yaounde), it is valid for Benin, Togo, BF, Niger and Cd'I, saves time and money.
For Nigeria the consulate in Buea, Cameroon is easy and friendly.
Ghana - get it in Lomé.
For Mali, in Yaoundé.
For Mauritania, in Bamako.
Did I miss any?
The situation with the border region Cd'I to Mali is still to be regarded as tense pending a few reports to the contrary - keep an eye on developements. If there is no positive news when you get closer I'd suggest heading Ghana-BF-Mali instead.
Dave
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