The correct answer is option 3, Nile. The Nile River is known as the longest river in the world. It stretches for approximately 4,135 miles or 6,650 kilometers, making it the longest river globally. This river is located in northeastern Africa and flows through eleven different countries, including Egypt, Sudan, Ethiopia, and Uganda. The Nile has played a crucial role in the development of ancient civilizations, particularly ancient Egypt. It provided water for agriculture, transportation, and sustenance for the people living along its banks. The river has also been a source of inspiration for many cultural and religious beliefs. Furthermore, the Nile is famous for its annual flooding, which has contributed to the fertility of the lands surrounding it.