I thought that the continents were defined by the tectonic plates that they were on and that there were cases of land borders that crossed multiple plates. So the continent of Europe is on a different plate then the continent of Asia.
I have always thought of the Ural Mountains as that border for the continents of Europe and Asia but I am used to looking for the mountain ranges, because those are formed due to the pressure of two plates colliding, and earthquake prone areas, subduction zones where one plate is being pushed under the other and consumed increasing the likelihood of earthquakes, as plate markers.
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