The answer is Nile. The Nile River is located in northeastern Africa and is generally regarded as the longest river in the world, with a length of approximately 6,650 kilometers (4,130 miles). It flows through eleven countries, including Uganda, Ethiopia, Sudan, and Egypt, before draining into the Mediterranean Sea. The Nile River is an important source of water for irrigation and agriculture, as well as transportation and fishing, and has played a significant role in the development of civilizations throughout history.