CultureInfo
won't be too helpful as it really centres around languages and doesn't store continent information(I'm not sure it could: ru-RU
Russian spans Europe and Asia for example, as does Turkish ).
The only thing I can suggest is to create a list of cultures that are African. The List of cultures can be found here:
MSDN CultureInfo[
^]. African countries seem to be poorly served: Afrikaans, English(SA & Zimbabwe) and North african Arabic seem to be the only options.