The DANUBE, DNIEPER, Dniester, and Dniepr are all rivers that flow to the Black Sea. The DANUBE is the longest river in Europe, stretching over 1, 770 miles from Germany to Romania. The DNIEPER is the third longest river in Europe, running through Ukraine and Belarus before emptying into the Black Sea. The Dniester is a river located in Eastern Europe, flowing through Ukraine, Moldova, and Romania before reaching the Black Sea. The Dniepr is a river located in Ukraine, Belarus, and Russia, and it flows into the Black Sea.