The Nile of Africa, which spans 6,650 kilometers (more than 4,100 miles) and flows northward across several northeastern African countries, is the world’s longest river. Over the centuries, the Nile has provided sustenance and livelihood for millions of citizens in the countries it passes through. Currently, Ethiopia is building what will become Africa’s largest hydro-power dam on the Nile. It will be a great resource for the area.