여기는 어디 있어요? (where is this)
거기는 어디 있어요? (where is that, if the destined place is far from the speaker but it is near from the listener)
저기는 어디 있어요? (where is that, if the destined place is far from both speaker and listener).
Hope that helps :D
i'm learning Korean too ㅋㅋㅋ