So I have been lurking abit on reddit and found a thread being glad we now don't have spoilers it's time to speculate.
Looking at the map of runeterra: https://map.leagueoflegends.com/en_US
We can see 10 regions( 8 in game ones + Ixtal and Shirima) , zooming in a bit we also see Bandle city and The void,
Bandle city won't be included since the most key character- Teemo is already in P&Z also lulu is in Ionia..
Now I read on reddit Riot confirmed that there will only be 10 regions but we have 11 bigs ones Shurima is gonna stand alone most likely since it's big, now the question is the void vs Ixtal...
The void has more champions but a lot of them are not geografically there..
that's why I think Ixtal (a 6 champion region in universe) is gonna be the last one.. then it leaves according to the region spread
8 Void champions,5 Yordles and 14 Runeterra champions that do not have any main region so we have them as "travelers".
I discounted those that already have a place btw.
Void:
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Shuriman Void people": Malzhar,Kassadin,Kaisa - they belonged to Shurima in the past so now they would return there.
Shuriman creatures: Rek'sai and Kog'maw
Ixtal roamer: Kha'zix (he fought Rengar in the jungle)
Unknown: Cho'gath and Vel'koz they can be anywhere.
Bandle city except Veigar and Yuumi all into P&Z, Veigar is probably in Noxus cause of Mordekaiser, and Yuumi is spirit like she would fit Ionia.
Runeterra: Obvious ones:
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Jax and Zilean: past residents of Icathia, a Shuriman city.
Bard: A celestial spirit so Targon is a natural fit.
Annie: raised in a Noxian territory, can't seem to fit anywhere else.
Fiddlesticks and Evelynn: thematically fit Shadow Isles.
Senna(champion version): Can be both Shadow Isles and Demacia really, she as herself is Demacian I think she will have a tie in mechanic like lucian.
The rest are less obvious at least for me:
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Shaco: no idea, he has so little lore about him.. he is a demon like FIddle, Evelynn,Nocturne and Tham Kench, I think I saw a story about him in Nxus but that's not a tie in at all.
Ryze: He is a mage that travels the continent I don't think he has a home region.. at all.. I think they will just give him a back story like teemo in a region probably in Ixtal.
Brand: His origin is Freljord but having a fiery card in Freljord would be weird since he is using elemental magic I would say he will be in Ixtal but I am probably wrong about this one.
Nami: she is a fish so Bilgewater…? not really..? she has some divine powers so maybe taragon? dunno…
Kindred: The spirit of death.. Shadow Isles right? probably right huh… they don't actually belong there though.
Alistar: We don't know much about him, but I can see him in Noxus.
Aatrox: The Darkin are originally from Shurima, failed ascended but his color scheme and warmongering reminds me of Noxus..
So what do you think? do you think the last region will be Ixtal.. or I am wrong and the void will be a region by itself? do you think you can find of a good placement for the 7 none obvious "runeterran" champions what about Cho'gath and Vel'koz?