To determine which body of water is closest to the Mediterranean Sea, let's analyze the options given:
- Lake Victoria - Located in East Africa, far from the Mediterranean Sea.
- Niger River - Flows through West Africa, with its mouth in the Gulf of Guinea, which is also far from the Mediterranean.
- Nile River - Flows north through northeastern Africa and empties into the Mediterranean Sea in Egypt.
- Lake Chad - Located near the border of Chad, Nigeria, Niger, and Cameroon, but far from the Mediterranean.
Given this analysis, the Nile River is the closest body of water to the Mediterranean Sea since it flows directly into it.
Correct answer: Nile River