| Countries | Geographical coordinates | |
| Latitude | Longitude | |
| Senegal | 12˚00' - 16˚30' North | 11˚30' - 17˚30' West |
| Guinea Conakry | 07˚05' - 12˚51' North | 07˚30' - 15˚10' West |
| Mali | 10˚00' - 25˚00' North | 4˚00' - 12˚00' West |
| Ghana | 04˚44' - 11˚11' North | 01˚11' - 3˚11' West |