The Nile is a major north-flowing river in northeastern Africa, and is the longest river in the world. It is approximately 4, 132 miles long and flows through eleven countries, including Egypt, Sudan, Ethiopia, and Uganda. The Nile has been an important source of water for irrigation and transportation since ancient times, and is also a major source of hydroelectric power. The river is also known for its rich cultural and historical significance, as it has been a major part of many civilizations throughout history.