User blog comment:Kacj321/Entire Tamriel Landmass built into Skyrim/@comment-4623022-20111122180414/@comment-2041582-20111122181122

They did this in Fallout New Vegas. At the Mojave Outpost there was a gate that required a key, and you could see it leading out into the wastes, going into California. Unfortunately they never made a DLC involving it, so I don't know if they're going to do the same for Skyrim (and yes, I know Obsidian made FNV, not Bethesda).