Willowmound
Wordbug
Where, exactly is that line, anyway?
The Ural mountains in Russia.
I mean, I'm pretty sure it's based on tectonic plates, so there's a geographical basis, but...there are myriad tectonic plates in North America. Maybe California should be considered a continent .
These things are based as much on tradition as they are on your kind of steely logic.
There is Europe, there is Asia. You can argue, but you cannot win.