> Do the Rocky Mountains count as dividing North America into east and west subcontinents?
The east part would be a bit small, but after a bit more seismic activity that may be sensible.
> Does the Baltic Sea partition the Nordic countries into their own continent?
Could be a subcontinent border yeah, it is a common division in Europe.
> Are you really expecting that logic to work even a little bit?
Yeah, there are multiple aspects of continents and topology is one part. Others are cultural and political and I think there the division is even more clear.
The east part would be a bit small, but after a bit more seismic activity that may be sensible.
> Does the Baltic Sea partition the Nordic countries into their own continent?
Could be a subcontinent border yeah, it is a common division in Europe.
> Are you really expecting that logic to work even a little bit?
Yeah, there are multiple aspects of continents and topology is one part. Others are cultural and political and I think there the division is even more clear.