Well, that was a tad rude of a response, especially as they tried extra hard so I could not see it even though they were talking to me...but hey...whatever floats their boat I suppose. We all have different ways we respond to things.
I'll still say that I'd put Forgotten realms as one of the most detailed settings out there (and as this is a ENWorld, one shouldn't be surprised by D&D fans talking about D&D worlds).
Harn is decent as well (but the OP I thought was asking for other opinions, or at least that's what I actually thought they were after from the original post).
As one can tell on the "interactive" map
Columbia Games interactive map for Harn
It lacks the "borders" on it if one goes for a surface view (of course, if one actually gets into the books, just like if they did for FR, they could either find or figure out borders and zones of control and all the rest, but won't go into that as my last response didn't seem to go over well here when I pointed out where to find them for FR, so can't imagine pointing it out for HARN would be well received, but there is a map for people to peruse if that is their thing).
I was unaware that the OP was actually after an electronic interactive map as their requirement for detailed settings, and I will admit, that wasn't my impression of what they were asking when they asked about borders. AS it SEEMS that was what they were asking about, I obviously did NOT answer the question they were wanting.
In that light, as I don't know the same resource for FR (or any other game really) nor even knew that existed I suppose I didn't answer what JD wanted.
However, as I DO know about Harn a little bit, I'll post the alternate map for Harn (as they posted one for FR) in their place instead (as should be found via the link above).
Not sure why that is a defining feature of how detailed a place is or why that says it's more or less detailed than another...but if that's what they are after...than...good luck to them on this endeavor.
I had no idea that was what they were actually looking for as a definition of detailed, if so, I guess I wouldn't have answered. In that light, my bad, sorry I misunderstood what the OP was asking or was after.