How was the modern geographic boundary between Europe and Asia decided?
Wikipedia puts the boundary as: > The modern definition of Europe delimits it from Asia at the Aegean Sea, the Dardanelles-Sea of Marmora-Bosporus, the Black Sea, along the watershed of the Greater Caucasus, the northwestern portion of the Caspian Sea and along the Ural River and Ural Mountains, as both mapped and listed in many atlases including that of the National Geographic Society and as described in the World Factbook. However, there is no cite for this and I can't seem to find definitive information. What group, or individual, put forward this as the boundary between Europe and Asia? I know that this boundary has changed a lot historically so I'm curious as to the most current boundary, assuming Wikipedia is correct.