What is the longest river in Europe outside of Russia?
The longest river that does not venture outside of mainland Europe is the Danube, which is 1,780 miles long and flows through 10 countries — from Germany to Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine, before emptying into the Black Sea. Many of Europe’s most scenic capitals are located on the Danube, including Vienna and Budapest.
Source: USA Today