context: The Volga originates on the Valdai Upland (at an altitude of 228 meters) and flows into the Caspian Sea. The mouth of the river lies 28 meters below sea level. The Volga is the world's largest river of internal flow, that is, which does not flow into the world's oceans.
question: Where does the Volga flow?
answers.text: Caspian Sea