Circle the antecedent of each boldfaced pronoun. 1. The Nile River flows over 4,100 miles through Africa. Near Alexandria, Egypt, it empties into the Mediterranean Sea.

2. The Nile River system is complex. It has many tributaries.

3. To find the source of a river, mapmakers search for the
source of the longest tributary that feeds into it.

4. There are two major tributaries of the Nile. They are the White Nile and the Blue Nile.
The Nile River runs through
the city of Cairo, Egypt.

5. The waters of the Blue Nile originate high in the mountains of Ethiopia. They are replenished each year by seasonal rains.

6. The White Nile flows from Lake Victoria and beyond. It supplies most of the Nia's water.

7. The two rivers flow together in Sudan. They meet near the capital city of Khartoum.

8. Later they are joined by a third major tributary. It is the Atbara River, which also flows out of Ethiopia.

9. For centuries, explorers searched for the source of the Nile. Many of them met with frustration,

10. A priest named Pedro Páez may have been the first European to reach the source of the Blue Nile.
He traveled there in the carly seventeenth century.

11. In 1858, John Hanning Speke saw a great lake. It fed the White Nile at Jinja, Uganda.

12. Speke named the lake after Queen Victoria. She ruled England at that time.

13. In 2004, members of the White Nile Expedition navigated the length of the Nile. The journey took them through remote parts of Africa.

14. Natalie McComb was part of that team. She was a tour guide based in Kampala, Uganda.

15. In recent years, other teams have navigated the Nile. They have braved many dangers to trace
the course of this river.