So here are some territories that, as far as I know, are never really visited in either AtLA or Korra. Maybe in the Kyoshi novels, but it’s a bit hard to discern locations.In any case, I have some headcanons concerning these places;
We see a handful of characters that appear to be based on people of South Asian and/or Indian descent, these being Guru Pathik and Jargala from the comics. I believe they come from the chain of islands that span from the Southern Air Temple to the Eastern Air Temple. It’s possible that these people may have mixed Air Nomad and Water Tribe ancestry
The coastline and the mountain chain along the south of the continent I think may be the Zhang Tribe homeland. Their dress and rugged lifestyle seem like they’d be suited for a very harsh and untamed region. This is around the area where Toph trained Aang in the quarry. I also thought that maybe the northern mountains of the United Republic would be where the Zhang hail from, but logistically is makes more sense for them to come from the South-East as that’s where they seemed to be coming from in The Great Divide.
(EDIT: Now that I look at it, I think the Zhang might come more from the Eastern side of the mountain range, which I found out are called the Xishaan Mountain Range)
The North-East peninsula is where I think the Gan Jin tribe come from. They would be close enough to the Zhangs to have had a long history with them. It may have been an area that saw a lot of travel and trade, and I imagine the Gan Jin to have been a wealthy merchant class, as opposed to the Zhangs. The area where their territories intersected might even be where the legend of Jin Wei and Wei Jin took place.








