What geographical feature marks the border between the Savannah and the Rainforest in the south?

The border between the Savannah and the Rainforest in the southern regions of the African continent is characterized by a transition zone marked by a variety of geographical features, with the Gabon River playing a significant role in this delineation. The Gabon River runs through areas that illustrate the change from the less dense, more open savannah landscapes to the dense, biodiverse ecosystems of the rainforest.

Unlike other rivers mentioned, such as the Zambezi and the Nile, which have broader or more significant ecological impacts in different regions, the Gabon River is geographically situated in the area where this specific transition occurs, thereby effectively serving as a boundary marker between these two distinct biomes. This makes it integral to understanding the spatial dynamics of vegetation and ecosystems in Central Africa, particularly in how rainfall patterns and humidity levels facilitate the growth of rainforest at lower elevations while allowing savannah ecosystems to thrive in adjacent areas.