Europe is the world’s third most populated continent, and the sixth largest continent by land area. Although physically connected to Asia, Europe has historically been considered a separate continent due to cultural and linguistic differences. The Ural and Caucasus Mountains are generally thought to be the eastern boundary of Europe. The other borders of Europe include the Black Sea and the Mediterranean Sea to the south, the Arctic Ocean to the north, and the Atlantic Ocean to the west. Europe is home to more than 10% of the world’s population.