[quote=@Willy Vereb]

1.) Earth
As in the real life Earth. Europe, Africa and all the rest. It gives you a sense of familiarity but of course natural resources and detailed terrain may be changed toi fit the player's ideas with his/her nation.

[/quote]

I'm actually going to go for this one since it means that the irl nations we base ours on would make more sense if we put them where the irl nations are.
Something that erks me in NRPs is how you could have a pseudo-Russia, a pseudo-Roman, a pseudo-China and a pseudo-France all next to each other with out any similarities even though realistically, they'd all be closer to one culture due to in game location.