The matter of map scaling in video games is something that's always a bit confounding. I work on the principle that in terms of size, video game maps tend to be scaled down by at least a factor of 10 on each axis, so e.g. Oblivion's 5-6 miles either way is going to be at least 50-60 and more likely 500-600 or (much) more. That's just a game I plucked out of the air as I recall someone saying that Cyrodiil's total area in-game is something like 30 square miles, whereas realistically it would be many thousands. So we're seeing at most 1% of the terrain and probably very much less.
That's convenient for video games where they typically run at 20-30x real time but your character doesn't move at 20-30x the speed, and nobody wants to spend a week's worth of gaming trekking from one village to the next. And where there are settlements, they're also scaled down by orders of magnitude so even the busiest game city might have a coupe of hundred people where realistically you could add on several zeroes.
My inclination is to think that we're not just seeing the scaling down of populations and countryside but also of the number of notable places. Of course the only notable places in a video game are the ones you visit, but who's to say that there aren't a whole slew of other duchies, counties, principalities and so on in Rivellon? I don't even know the name of the country I'm in let alone what counties and towns it contains. I'm somewhat reminded of the opening part of Terry Gilliam's Jabberwocky.