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So I have been using my half remembered geology lessons from over a decade ago to try and figure out some explanation as to how the landmass of the Haato/Haachama nations split apart without affecting the rest of the gen1 continent. There are probably much more realistic, or at least elegant, ways to explain it, but fuck it, the ideas were rolling around my head so now you lot may as well get them too.
The Haato/Haachama split would normally just be because of diverging plates forming a trench, but the fact they are both separate from the main continent which is unaffected is harder to explain. I'd say that this means that there are in fact three plates, one for each landmass, but that doesn't quite solve it as the split between landmasses would have to be at roughly 120° for them to be caused by all three plates diverging, but there wouldn't have been a trench formed from the mainland with just the Haatochamas plates diverging. Therefore my slightly above uninformed opinion is that while the Haatochama plates are diverging, they are actually both converging with the main continent, and in several thousand years they would connect.
I can't find a decent real world example of this type of plate meeting, but what I guess this would mean for the present is that all three coastlines would be mountainous, especially on the current southern gen1 landmass, earthquakes would be quite frequent and of decent magnitude, and there is also a possibility of volcanic activity, particularly at the junction between all three plates.
