I’m, uh, assuming you said that before Yeti said all this?
[9:26:20 AM] BwdYeti: world map max is 2048x2048 without code changes
[9:26:34 AM] BwdYeti: /4096x4096 with hi def whatever
[9:26:57 AM] BwdYeti: just because that’s the max size of one texture, you could make the map bigger by loading more textures and just drawing the visible ones
That’s the maximum size of a graphic allowed in (any)XNA, but battle backgrounds are specifically 320x160 by default, with the area below them presumably being plain black? Graphics in general won’t show more than 320x192 at a time, since that’s the total screen resolution at 1x zoom (though I don’t think changing zoom actually changes resolution?), so it’s also the size of the title screen and "CG"s (which don’t have official support, but don’t worry about that)