Five Least Populated Countries by Continent

Now Cyprus is an entirely different case because continents are just made up for convenience and they're typically just massive land masses, so islands complicate the classification process which is why we then resort to plate boundaries. I have no idea where Cyprus is on its plate, so maybe that would clear it up idk.

The common held borders of asia and europe are very modern. Generally only being used after the second world war.

Prior to that the Europeans saw the borders of europe being:

The western borders of afghanistan and pakistan, the western coast of the caspian sea including all of the caucauses, the ural mountain range making up europes eastern extent.

In the south the northern borders of mali, chad, sudan, niger and western sahara.

In the east the atlantic and north sea coastlines.

The north was scandinavian countries northern borders and the northern coast of russia to the urals.

These borders were based on the extent of the alexandian empire , the roman empire, and the slavic regions.

Moreover the naturalised peoples within: Slavs, nordo-germans, celts, latins, greeks, egyptians, phonecians, persians were all considered part of the indo-european cultral and language family.

Even today many countries in modern Asia see themselves as being European.