Well, think about it. This is a medieval-like world.
People on the same continent would more or less know each other. Different races would probably bump into each other at least once in awhile. Though a few remote places might have not seen others in forever.
But on another continent? They'd probably only hear rumors of what might be over there. Messages from clerics who've asked their gods, or traders who have traveled there.
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather