| Study area | Rain fall | Types of soils | Vegetation | Geographic coordinates |
| MBOMO-KELLE logging concessions | 1450 - 2100 mm | Ferrallic soils Hydromorphic soils | Forests on terra firma Swamp forests | 14˚00''E; 15˚00''E; and 00˚27'35.9'' North 00˚22'03'' South |
| MOKABI-DZANGA logging concessions | 1500 - 2000 mm | Ferrallic soils Hydromorphic soils | Meliaceae forest on terra firma Some forests on terra firma | Latitudes 2˚40' et 3˚40' Nord et les longitudes 16˚30' et 17˚40' Est |
| GOUONGO logging concessions | 1400 - 1600 mm | Soils on granites and exoned Gneiss Hydromorphic soils | Forests on terra firma Forest on Hydromorphic soil | 03˚07'22.9 Sud; 13˚15'00.0 Est |
| IMPFONDO-DONGOU forest | 1600 - 1800 mm | Ferrallic soils Hydromorphic soils | Forests on terra firma Swamp forests Degraded forest | Lat, 2˚2’47.56''N; Long, 18˚3’3.51''E |