It's a small world
Once upon a time there were blossoming civilisations, airships, kings, and more great heroes than you could shake a fairly large stick at. Their time has come, and gone. The devastating War of the Skies between Dwarves and Humans has reduced the great Western and Southern empires to ruin, save for a few strongholds.
Ironically , the only parts of the world to remain largely untouched by the Sky War were those northern satellite trading nations being fought over. The Eastern realms of the Eladrin and the Elves also withstood the ravages of war by virtue of their neutrality and remoteness, respectively. Their survival is less ironic.