The terrain of the lower Wouri in the Yabassi shows 25% of downstream area covers 700 m, 50% on 500 m and only 1/3 the area of the lower lying below 200 m.
The topography of the downstream Wouri in Yabassi showed 25% of the downstream located on 700m, 500m, and only 50% of the area of the lower third is below 200m.