What are the two mountain ranges that form the border between Asia and Europe?
– the Ural Mountains – the Caucasus Mountains However, it could be a little more complicated: 1) “Physiographically, Europe is the northwestern constituent of the larger landmass known as Eurasia, or Afro-Eurasia: Asia occupies the eastern bulk of this continuous landmass and all share a common continental shelf. Europe’s eastern frontier is now commonly delineated by the Ural Mountains in Russia. The first century AD geographer Strabo, took the Tanais River to be the boundary, as did early Judaic sources. The southeast boundary with Asia is not universally defined. Most commonly the Ural or, alternatively, the Emba River serve as possible boundaries. The boundary continues to the Caspian Sea, the crest of the Caucasus Mountains or, alternatively, 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. The western boundary is the Atlantic
