Europe is one of the five inhabited traditional continents of the Earth. Physically and geologically, Europe is the westernmost peninsula of Eurasia, west of Asia. Europe is bounded to the north by the Arctic Ocean, to the west by the Atlantic Ocean, to the south by the Mediterranean Sea, and to the southeast by the waterways adjoining the Mediterranean to and including the Black Sea and the Caucasus Mountains. On the east, Europe is divided from Asia by the water divide of the Ural Mountains and by the Caspian Sea.