evidence: The Democratic Republic of the Congo (DRC) is the largest country of sub-Saharan Africa, occupying some 2,344,858 square kilometres (905,355 sq mi).[1] Most of the country lies within the vast hollow of the Congo River basin.[1] The vast, low-lying central area is a plateau-shaped basin sloping toward the west, covered by tropical rainforest and criss-crossed by rivers. The forest center is surrounded by mountainous terraces in the west, plateaus merging into savannas in the south and southwest. Dense grasslands extend beyond the Congo River in the north. High mountains of the Ruwenzori Range (some above 5,000 m or 16,000 ft) are found on the eastern borders with Rwanda and Uganda (see Albertine Rift montane forests for a description of this area). [...] In this region, changes in elevation bring marked changes in vegetation, which ranges from montane savanna to heavy montane forest.[1] The Rwenzori Mountains between lakes Albert and Edward constitutes the highest range in Africa.[1] The height and location of these mountains on the equator make for a varied and spectacular flora.[1] [...] Terrain: vast central plateau covered by tropical rainforest, surrounded by mountains in the west, plains and savanna in the south/southwest, and grasslands in the north. The high mountains of the Ruwenzori Range on the eastern borders.