The Limpopo River is a river in southern Africa that flows through Botswana, South Africa, and Zimbabwe. It is the fourth longest river in Africa and is approximately 1, 800 miles long. The Niger River is a major river in West Africa, and is the third longest river in Africa. It is approximately 2, 600 miles long and flows through Guinea, Mali, Niger, Benin, and Nigeria. The Zambezi River is a river in south-central Africa that flows through Angola, Zambia, Zimbabwe, and Mozambique. It is the fourth largest river in Africa and is approximately 2, 200 miles long. All three rivers are important sources of water for many African countries.