I do not think that is the sea in the vinewood top part, in fact, I highly doubt it, considering what I've seen looking over this. That is distance fog playing tricks on your eyes:
It is likley impossible for that to be the sea, just by comparing the two pictures, those are not the same mountains imo.
Not unless that's east, and it's not. I really don't think the sea is north.
But moving on, what are the UNKNOWNS right now? Lemme take a look at something that is a mystery, let's get back on track, if there is any weight to the north needing changing the east needing more land, I'm sure someone will find it. I could be totally wrong, I know. I just don't see them being so retarded they put the sea north when it's not there in real life. Everything else is all where it goes, but not that.