Is there a sub-mod that adds counties to Westeros?

Basically what the title says. I'm interested in giving the Great houses of westeros (ie the Targaryens, the Starks, the Lannisters ex ex) a few more (non-canon) holdings without having to change around the existing nobles too much. However, I'm pretty much pants at editing the game map to create new counties, and was hoping that there is an existing mod that had already added in more counties to Westeros. So, is there one?