Which one of the following rivers does not drain into the Black Sea?

The Volga is the longest river in Europe and flows through central Russia, ultimately draining into the Caspian Sea, which is an endorheic (closed) basin [1]. It does not drain into the Black Sea, although it is connected to it via the Volga-Don Canal [1]. In contrast, the other rivers listed are major contributors to the Black Sea drainage system. The Danube, Europe's second-longest river, drains into the Black Sea via the Danube Delta. The Dnieper (or Dnipro) flows through Russia, Belarus, and Ukraine to reach the Black Sea. The Don River flows into the Sea of Azov, which is connected to the Black Sea via the Strait of Kerch, thus making it part of the broader Black Sea drainage basin [1].

Sources

1. [1] FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII (NCERT 2025 ed.) > Chapter 7: Transport and Communication > The Volga Waterway > p. 65