Really can't be done without saying "The treasure is located in the area called: The Goblin Wastelands" or something like that.
NWN doesn't really understand how to compute relative directions between areas...as they may not even link up in a logical manner.
The thing about the buried treasure maps is that they should be accompanied with some RP-ish riddle, clue or other type of information to get the treasure hunter on the right track...much like if it were a GM-led quest and you got clues from all the events. In the case of the buried treasure maps, it's really up to the character who gives it out to also provide the clues in one way or the other.