Located entirely within the flexure formed by the West Congo Range 1; 2, the undulating terrain of the city of Matadi, also visible on the right bank of the Congo River, is characterized by interfluves more or less parallel to the Congo River's N132° flow. These interfluves are interspersed with hills separated by asymmetrical valleys with slopes inclined either upstream or downstream. This terrain is also characterized by a succession of straight valleys, some deep and some not, running N124° parallel to the Mpozo River. This morphological diversity may be linked to the hardness and climatic weatherability of the fissile schists of the Palabala Formation, the Matadi metaquartzites, the Noqui granite, and the Gangila metabasalts, or to tectonic deformations3 4.
K.A et al. (Thu,) studied this question.