jtougas is on the money. It's all about you and your take on things. Let's face it, when it comes to mapmaking there's always the question of how realistic you plan on making it. Often people want to put in an element of realism, but there's also ways around it. The easiest explanation is magic, but you could also create an artificial split in a river because of a town. If they go out of their way to split it, it could theoretically happen for a while. It's also interesting to just look through that thread because, sometimes, even our living world does things that make us scratch are heads and want to call foul(or fowl since Turkey Day and all). Either way, I know I haven't spoken too much on the map, but it's coming along quite nicely.