The world's longest river is the Nile River, stretching approximately 6,650 kilometers (4,130 miles) through northeastern Africa. It flows through several countries, including Uganda, Sudan, and Egypt, before emptying into the Mediterranean Sea. The Nile has historically been crucial for agriculture and civilization development in Egypt and surrounding regions, providing fertile land and irrigation. Its annual flooding replenished the soil, supporting ancient Egyptian society. Today, the Nile remains significant for transportation, culture, and as a critical water source for millions of people living along its banks.