Europe is a continent that comprises the westernmost part of Eurasia. Europe is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, and the Mediterranean Sea to the south. To the east and southeast, Europe is generally considered as separated from Asia by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways of the Turkish Straits.
Europe encompasses an area of 10,180,000km² (3,930,000 square miles), stretching from Asia to the Atlantic, and from Africa to the Arctic. European countries welcome more than 480 million international visitors per year, more than half of the global market, and 7 of the 10 most visited countries are European nations. It's easy to see why - a well preserved cultural heritage, open borders and efficient infrastructure makes visiting Europe a breeze, and rarely will you have to travel more than a few hours before you can immerse yourself in a new culture, and dive into a different phrasebook. Although it is the world's smallest continent in land surface area, there are profound differences between the cultures and ways of life in its countries.
Europe as a cultural concept is substantially derived from the shared heritage of the Roman Empire and its culture. The boundaries of Europe were historically understood as those of Christendom (or more specifically Latin Christendom), as established or defended throughout the medieval and early modern history of Europe, especially against Islam, as in the Reconquista and the Ottoman wars in Europe.