name the mountains, river, and the sea that formed europe's eastern boundary
Eastward, mainland Europe widens much like the mouth of a funnel, until the boundary with Asia is reached at the Ural Mountains and Ural River, the Caspian Sea and Caucasus Mountains.Land relief in Europe shows great variation within relatively small areas.he boundary continues to the Caspian Sea, the crest of the Caucasus Mountains (or, less commonly, the Kura River in the Caucasus), and on to the Black Sea. The Bosporus, the Sea of Marmara, and the Dardanelles conclude the Asian boundary. The Mediterranean Sea to the south separates Europe from Africa.