CaptAdventure wrote:

I keep wanting to run a campaign in a prefab setting. Mostly for the maps and general politics. (I'm constantly worried that my self-created maps aren't geologically or sociologically accurate!)

Only I can't really find a campaign setting that suits my taste. Even when I plan to use something like Pathfinder's Golarion, I find myself making changes.To the point where I wonder why I'm using the setting as a jumping off point at all!

For myself, I'm not a big fan of historical fantasy settings. Something about them just feels a little too mundane to me. (I do find it weird that there are all sorts of pseudo-medieval campaign settings, when we hit the mid-to-late Renaissance, things often switch to alt-history fantasy, rather than a fantasy setting with rapiers and firearms.)
 

Paul, if you are worried that your self-created maps aren't geologically or sociologically accurate, then I think you may be over-thinking it. Your players won’t notice!
 
If you want to run a prefab setting, fine. But unless you love everything about the setting you will make changes – we all do when running such settings, as you need to make it fit you and your players’ preferences. This is the reason I prefer using other people’s work as inspiration rather than following it closely – it’s less work in the long run.
 
It’s what The Git and I were talking about. A loose framework provided by someone else with enough room to add your own stuff (like Simon’s Lemuria) is easier than adapting a densely written setting to get it the way you want.
 
And when it comes to settings written by you, if you aim for the same level of detail as Lemuria to start with, you can add more stuff as you go along. Even if players unexpectedly go ‘off the map’ you will find it easy to extemporise off the top of your head in a way that makes sense, as it’s your setting.
 
Or at least that’s how I’ve found it – YMMV.
 
I hold my hand up to confess that I don’t find historical fantasy settings mundane, but then I’m a history nut!