Interesting!
Personally I feel like it’ll relate to the countries that believe in the “Sun God” and that all those countries were once one island but when Joyboy lost the final war, he had one of the inhabitants, Oars, to separate the island into four.
The ancient Kingdom, Jaya, Elbaf, and a fourth where all the kingdoms took a name of one of the gods.
God of Sun Nika - Ancient Kingdom
God of Forests Elbaf
God of Earth Jaya
God of Rain - Fourth Kingdom
The reason I think this is possible is because Oars name can be translated to Oz and we’ve yet to see the “Emerald City” so it wouldn’t shock me if the Emerald City is on Raftel which in wizard of oz was a place of the future.