Question

Question was provided via image upload.

Explanation:

To determine the river at #4, we analyze the options: The Nile is in Africa, the Mississippi in North America, the Danube is in Europe but not matching #4's location. The Volga River is a major river in Russia (part of Europe/Asia), and the map's #4 location aligns with the Volga's region.

Answer:

The Volga River