DaHuuuuuudge on 05 December 2010
"Bethesda claims that the scale of the game is equal to twice the size of Great Britain:[1] around 487,000 square kilometers. The game world features over 15,000 towns, cities, villages, and dungeons for the player's character to explore."
Daggerfall.. Never played it but i heard it's just massive.
http://en.wikipedia.org/wiki/The_Elder_Scrolls_II:_Daggerfall
