What is the longest river in Africa?
The longest river in Africa is the Nile River, which stretches over 4,135 miles (6,650 kilometers) in length.
Complete the following task based on the instruction and optional input provided.### Instruction:
What is the longest river in Africa?

### Output:
The longest river in Africa is the Nile River, which stretches over 4,135 miles (6,650 kilometers) in length.