| Site description | Sample points | Samples | Latitude | Longitude | Altitude (m) | |
| Lom | Lom upstream | LOM1 | 5 | 14.1129 | 5.7308 | 687 |
| Lom middle | LOM2 | 4 | 14.0874 | 5.6332 | 682 | |
| Lom downstream | LOM3 | 5 | 14.0379 | 5.6277 | 683 | |
| Mari main river | Mari main river upstream | MMR1 | 5 | 14.3484 | 5.6158 | 877 |
| Mari main river downstream | MMR2 | 3 | 14.1541 | 5.6460 | 818 | |
| Mari main river downstream | MMR3 | 4 | 14.1457 | 5.6575 | 793 | |
| Mari main river downstream | MMR4 | 5 | 14.1373 | 5.6617 | 702 | |
| Mari main river downstream | MMR5 | 5 | 14.1015 | 5.6386 | 688 | |
| Mari tributary on the right bank | Bissiri | MRB1 | 4 | 14.3094 | 5.6537 | 904 |
| Bissiri | MRB2 | 4 | 14.3016 | 5.7469 | 953 | |
| Béoudou | MRB3 | 4 | 14.2703 | 5.6833 | 899 | |
| Mari tributary on the left bank | Mombal | MLB1 | 5 | 14.2806 | 5.4996 | 918 |
| Béri | MLB2 | 4 | 14.1623 | 5.5474 | 897 | |
| Pawara | MLB3 | 4 | 14.0897 | 5.5766 | 779 | |
| Bédéré | MLB4 | 5 | 14.0918 | 5.6124 | 700 | |
| Littoro | MLB5 | 5 | 14.1033 | 5.6357 | 688 | |