The correct answer is option 'D', the Nile River.

Explanation:
The Nile River is the longest river in Africa and one of the longest rivers in the world. It is approximately 6,650 kilometers (4,130 miles) in length and it flows through eleven countries in northeastern Africa, including Egypt, Sudan, South Sudan, Ethiopia, Uganda, and others. The river has two main tributaries, the White Nile and the Blue Nile, which merge near the Sudanese capital, Khartoum.

Key Points:
1. The Nile River drains into the Mediterranean Sea.
2. The river has played a significant role in the development of ancient civilizations, particularly in Egypt, where the river valley provided fertile land for agriculture and facilitated transportation and trade.
3. The Nile River is known for its annual flooding, which brought rich sediments that replenished the soil and supported agricultural activities.
4. The river is also famous for its historical landmarks, such as the Great Pyramids of Giza and the Valley of the Kings, which are located along its banks.
5. The Nile River has been a vital source of water and sustenance for millions of people, and its importance continues to this day.
6. The river is also a popular tourist destination, with cruises and tours offering visitors the opportunity to explore its ancient wonders and natural beauty.
7. The Nile River has also been a subject of international disputes and negotiations, particularly regarding water rights and dam construction.
8. Overall, the Nile River is not only a geographical feature but also a cultural, historical, and economic lifeline for the countries it traverses.