There just seemed to be some parts where the tiles themselves weren't lining up an example is where the edge of the water is, I also noticed the other thing you were talking about of it not being clear whether or not you could continue or not but here's a snippet:
As for the transition areas, I mean this:
Doesn't look traversable but it takes you to a whole other map. Given that:
This seems like it should take me to another map as well, however it either doesn't or I didn't progress far enough for it to allow me to.
Otherwise yeah there were some parts that some areas seemed like I was just not able to go there but I managed to wiggle through some gaps, still got stuck eventually:
One such example in the northern map to the west side:
The bush below and to the left of me is passable, that's how I got back here.