Demon world is the underwater theory
So! First of, we can all probably agree on the fact that oceans = continents in the demon world, seas-lakes = islands and the otherwise. Then, we know the whereabouts of Gracefield (somewhat), and if Grace Field is not located on water, then there are few variants on its human world whereabouts: Atlantic ocean or Pacific ocean. We also have the GF coordinates, because I refuse to believe it became the centre for the map just because the Grace Field is located there, but rather that GF was located there BECAUSE it was in the zero coordinates. So, at part, Grace Field could be located right in the middle of an ocean.
Next, if we take into consideration that they woke up pretty close to the Statue of Liberty (NY), we can assume it's Atlantic Ocean we're talking about. Of course, the centre of the ocean is not by NY, but the elevator could target the closest piece of land - either by America (≈Washington-NY), Puerto Rico or Western Sahara. So, it works.
Then, thinking about the map to Goldy Pond and such, we can assume that Grand Valley is in the eastern part of Atlantic Ocean, therefore people from GV woke up either in the islands in there or around Spain-France-Britain.
Mass-production farms, of course, aren't limited, so people from there could really appear anywhere, but while we're at it, I wanna find the Paradise Hideout on the map of, as I believe, Atlantic Ocean. From a point where they came to/from westerland, it's 10 day journey to the Jaw of Lion and it's not too far from the Grace Field and about few days journey from the capital, also not too far from the GF. From that, I think Capital is somewhere above-eastern from Bermudian Islands, while Hideout is south and eastern from the Capital. The Hideout itself is probably a bit closer to GF, while Capital might as well stand above the 'lakes' of Bermudian.
Now, the Cuvitidala, because a meaningful place like that wouldn't be just somewhere, right? Yet it should cross the Eurasian Ocean or America Oceans. And its coordinates are D528-143. So...
If we take so much into the direction, Cuvitidala would be somewhere near Greenland or Canada. So, it's probably somewhere in the Northern part of Labradorian Sea.
Now, the Temple. It is located west from the bunker, as I guess, within a big territory. So it is possible for it to be somewhere in either the Bermudian Triangle, Carribbean or alike, maybe by Brazil. Out of these varians I personally like center of Bermudian Triangle the most, but you can choose anything different for all the locations.
Next location would be Glory Bell, out of which we know it's been located a bit close to the bunker - possible further than Grace Field, but even a kiddo newbie shown in the manga made it to the shelter, so it wouldn't be across all the ocean (unlike Goodwill Ridge, which we know nothing about, but it might be located Northern). So my guess would be eastern from the Bunker, but beneath on the map not to be too close to GV - so, pretty close to Morocco (e.g. a 'romantic' farm for aristocrats by the ocean) or even somewhere around Mediterranean sea??
So, the Atlantic Ocean would be almost completely or completely Legravalima's empire. But there bound to be other nations in the demon world, probably still dependant on her empire (because of meat), but still more or less independent, at least enough to have their own ruling systems or monarchy or something like that and be considered other nations. And if whole Atlantics is Legravalima's and it's the biggest, there are bound to be at least quite many of those, given there's a Pacific Ocean, Indian ocean, the seas which would be island countries... All of those. Now that is not plot-related, so I'll just mention in briefly, but if there were people all around the globe appearing, not just Atlantics, we would have at least mass-production farms not just in the Empire, meaning much more autonomy for other countries and that at least the royalty would have food to eat even at the war with the Empire. That's not counting secret and illegal places like Goldy Pond was, because I bet you my life, there are more places like that.
Okay, so. All these locations are settled. Now, one more moment I just adore about this theory?
Anyone remembers this legendary place called 'Atlantis'? Located somewhere in the Atlantic ocean, it was sometime ago powerful and cool, but now it's underwater? The 'time ago, world was bigger' stories?
In 2045, it's been a 1000 years since worlds came apart, so it happened somewhere in the 1040s, maybe 30s. Meaning, all the Roman Empire stuff and Byzantine empire and Early Middle Ages, it all happened with demons around. Humans weren't loosing as much, at least not in Atlantics.
The Americans probably had few human tribes who taught themselves camouflage and traps to survive - evolving into Maya and Aztecs and such.
Asia was talking to the Pacific Ocean guys more than Empire, so they could possibly make their own pacts and promises alike, and so a lot of their mythology came from demons.
Africa was hunted a lot, but like in America, it begun filling with assasin-like people who knew precision and such.
Europe... Was in war always, so it weren't news for us, we just... Fought?? Maybe one of those historic tribes we fought a lot which were killed by us in the 11th century were actually demos and history textbooks just don't know that? Seems plausible.
But the alliance of Ratri and other few? It was located IN the empire, meaning they were, in fact, loosing the most, but they were also really powerful as they did survive for a lot of time. They surely had a capital, strong and beautiful, surely had their own COUNTRY or whatever it was called back then, that just- fell under the water when Promise was forged.
So yes, I do state that Grace Field kids can therefore be called descendants of the rulers of the Legendary Atlantis, thank you for your attention.
