Elder Scrolls IV: Oblivion Q&A

Experience Gaming has published a Q&A with Bethesda's Todd Howard, in which the executive producer reveals some new information about the upcoming Elder Scrolls IV: Oblivion. A taste:
Q: Those of us who are explorers wish to know how you are planning on implementing a border for the map [province]. Will this be similar to Morrowind's infinite ocean?

A: There is a (border) you basically hit an invisible wall and the game says (you've reached the edge go back). So no, there is not infinite water. Cyrodiil is surrounded by the other provinces, so we have to do a border. As much as possible, we try to make this a physical barrier, like a mountain, but that just looks odd sometimes, so we go with the game message. But because you can now see so far, we've had to build miles of landscape into these provinces, because even though you cannot (go) there, you can stand on a mountain and (see) there.