Islands at the southern edge
Leonida Keys
A chain of islands off the southern coast — boats, small towns and the kind of quiet that hides smuggling.
The Keys are Jason's home turf and the closest thing GTA 6 has to a frontier: bridges, marinas, run-down houses on stilts and water in every direction. It is where the game's quieter criminality lives — the boats, the docks and the people who never appear in a Vice City nightclub. Geographically it mirrors the Florida Keys, stretched along the southern rim of the map.
The Keys are the quiet half of the map and the reason the setting has a frontier at all: islands in the south, water between everything and a criminal economy that runs on boats rather than clubs. Jason's story starts here and Brian Heder's trade lives here. Specifics such as which islands exist, what stands on them and how travel between them works are not part of anything Rockstar has confirmed.
In roleplay
Islands suit the slower, more local kind of roleplay: small communities where everyone is known, long distances between neighbours and a coast that makes smuggling plausible as a way of life. A server can build a Keys faction on boat work, dock politics and a strong us-versus-the-mainland identity. The reverse needs planning too, because isolation makes recruitment hard, so decide early how the mainland reaches the islands.