Danube
There are various rivers that are in both eastern and western Europe, but the most significant one would be the Danube.
The Ural Mountains that run through Russia and the Ural River, which flows from Russia, through Kazakhstan to the Caspian Sea.
The Most important river for Eastern Europes transportation is the Danube River.
The Danube River.
The Missouri river
Europe's eastern boundary is formed by the Caspian Sea, Ural River and Ural Mountains. The border also runs through the countries of Russia and Turkey.
The name is Ural. Although not everyone agrees with this particular demarcation of the Europe/Asia dividing line.
Western
Europe and Asia are separated by (North to South) the Ural Mountains, the Ural River, the Caspian Sea, the Caucasus Mountains and lastly, the Black Sea.
Rhine River
The river Danube (Dunărea in Romanian language)
The Mississippi River.