The Sahara desert is located in Africa. The largest mountain range is in northwest Africa and Mt. Kilimanjaro is located in Tanzania. Africa's largest lake is Victoria and the longest river is the Nile. The second longest river is the Congo, also known as the Zaire River. Savannas are grasslands with scattered trees, while plateaus are high plains. Steppes are grassland plains without trees. Wadis are dry valleys that experience water flow during rainy seasons. Cataracts involve rocks and small waterfalls in rivers. Deltas are landforms created at river mouths. Tropical rain forests receive over 100 inches of rain annually and have dense jungle plant growth on the forest