"Location" is something that was filled in from then named "Reviewing the Kanji" when accounts were linked with the kanji study site (now called Kanji Koohii). It wasn't on PuBB as far as I remember, and has been lost during conversion. Could have been maintained as a "custom field" on user's profiles but it didn't seem worth the trouble.
Edited: 2016-01-17, 12:45 pm