P.S. in France, are the Americas split up into North and South America, or a both continents considered one? it would be absurd for that to be the case and Europe and Asia to be two separate continents. North and South America are as separated as Eurasia and Africa.
Are you considering that the natural geographical issues are what draw the borders of civilisations ? This is absurd. Especially in Europe with his more than 3 thousand years old history. Look at a map of Europe an you will see that most of the borders are not geographical but historical, political and religious. The actual border between Croatia and Bosnia-Herzegovina, for instance, marks exactly the border between the Christian world (croatia) and the Ottoman Empire in the 17th century. Less than 10% of Turkey is on the geographical Europe. Is it enough to say that Turkey is a European country ? Of course not ! Things are far more complicated.