I should add that if you had the wrong mix of characters in BG1/2 that they would eventually attack one another. But you need a lot more companions before they can throw in that mechanic.
Maps aren't supposed to be right next to each other whatever we're talking about BG1 or BG2.
There are always a few hours when you travel between maps.
Some were supposed to be right next to one another, like the different sections of Baldur's Gate itself or the temple directly east of the first city south whose name I forget (was it Beregost?). But I don't recall ever being waylayed by enemies travelling between them.
