Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It comprises the westernmost part of Eurasia and is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east. The eastern border comprises a long and mixed line of mountain ranges and waterways that would normally define a subcontinent. However, Europe is generally accorded the status of a full continent because of its great physical size and the weight of history and tradition. It is the 6th largest continent in the world. Europe is commonly considered to be 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.