Down to two
Burkina Faso Niangouri
Cameroon Cases-obus de Karsiki
I could not find Niangouri not even on an archaeological map of Burkina Faso, although it is supposed to be one of the most significant archaeological sites in the country. I guess it has competing names, but I couldn't crack it.
As to Cases-obus de Karsiki (aka Kapsiki)
: Solivagant found out that there are two ethnic groups with cases-obus which could be meant, either the Kapsiki who live further away from Waza NP at Rhumsiki or the Mousgoum who live nearer to Waza NP. Since both Waza NP and the Kapsiki are mentioned in the name there is no way to find out which of the two was meant. I would hence suggest for us to adopt two coordinates, one for each alternative. I think this would be a more informative solution than leaving both out. Rhumsiki
10.48333333, 13.6Bouli Mousgoum