| Country | Extended Hinterlands | Total number |
| Cameroon | Nigeria, Chad, Central Africa Republic, Congo Republic, Equation Guinea, Gabon | 7 |
| Equation Guinea | Cameroon, Gabon | 2 |
| Gabon | Cameroon, Equation Guinea, Congo | 3 |
| Congo R. | Cameroon, Gabon, C.A.R, D.R Congo | 4 |