Mount Kilimanjaro in Tanzania is the highest point in Africa at 19,340 feet. The lowest point is Lake Assal in Djibouti, which lies 155 meters below sea level. The Sahara desert, located in North Africa, is the largest desert in the world, covering a third of the African continent. The longest river is the Nile River, which flows through eleven countries in northeast Africa and has a length of 6,670 km.