REC 185 / 356 · Leonida atlas
Mariana County
County PG · Port Gellhorn
Mariana County is a county in the southern State of Leonida due to appear in Grand Theft Auto VI. It was first named on an Interstate 404 sign in Port Gellhorn during the second trailer, and it appears to encompass the Grassrivers and Leonida Keys regions. The county is likely modeled on Monroe County, Florida, which covers the Everglades and the Florida Keys.
County file
What Mariana County is on the GTA 6 map
Mariana County is Leonida’s southern and southwestern edge — the watery end of the state, where the mainland breaks up into islands, keys, and sawgrass. It’s the county of the Leonida Keys and the Grassrivers wetlands, the two most distinctive natural regions in the game.
This is where Jason Duval’s story begins, out among the overwater highways and boat yards of the Keys. Confirmed places under Mariana include Key Lento and Watson Bay. In real-world terms it blends Monroe County — the Florida Keys — with the Everglades that spill across South Florida’s bottom edge.
County seat: Key Lento. Real-world resemblance: Monroe County, Florida (the Keys) blended with the Everglades — fan mapping, not officially confirmed by Rockstar.
Cities & towns
Cities & towns in Mariana County
Media
Mariana County on the GTA Wiki
Location data via GTA Wiki (Fandom), CC BY-SA 3.0. Summary text is our own editorial writing.
More places in Port Gellhorn
Frequently asked questions
Are the Leonida Keys in Mariana County?
Yes. The Leonida Keys — the southern island chain modeled on the Florida Keys — sit inside Mariana County, along with Key Lento and Watson Bay. The Grassrivers wetlands are part of the same watery southwestern county.
Where does Jason live in GTA 6?
Jason Duval starts the game in the Leonida Keys, within Mariana County, living on Brian Heder’s boat yard. The county’s smuggling-and-boats character is central to the early story.
What real county is Mariana based on?
Chiefly Monroe County, Florida — the Keys and their Overseas Highway — mixed with the Everglades. It’s the natural, low-lying end of Leonida rather than a built-up metro.