Revision 18

Grassrivers

Grassrivers is a vast wetland region of Leonida, modelled on the Florida Everglades. Rockstar has not shown where it lies relative to Vice City and Port Gellhorn. Rockstar's official description reads: "The untamable jewel of Leonida's crown. You never know what lies beneath the surface of this primordial expanse. The gators may be the most famous attraction, but there are far deadlier predators and weirder discoveries among the mangroves."

Grassrivers is one of six confirmed major regions in Grand Theft Auto VI, alongside Vice City, the Leonida Keys, Port Gellhorn, Ambrosia and Mount Kalaga National Park. Which counties it spans has not been confirmed, since Rockstar has not published county boundaries. Its name is a direct reference to Marjory Stoneman Douglas's 1947 book "The Everglades: River of Grass," which brought national attention to the Everglades ecosystem and helped spark conservation efforts that eventually led to the creation of Everglades National Park.

Environment

Grassrivers is a primordial swamp. The terrain consists of flooded grasslands, murky channels, shallow waterways, and thick mangrove forests. Sawgrass prairies stretch across wide expanses where the water level sits just above ground. The vegetation is dense and tangled: mangroves (named specifically in Rockstar's description), tall grass, and tropical wetland plants that obscure the view and hide whatever lives beneath the surface.

Official screenshots show police vehicles chasing a pickup truck through water that reaches multiple feet up the doors. The whole area is saturated. Roads exist but they cut through flooded terrain, not around it. Buildings in the region sit on stilts, consistent with real Everglades architecture where structures must be elevated above the water table.

The atmosphere contrasts sharply with Vice City's neon urban environment. Where Vice City is concrete, glass, and nightlife, Grassrivers is mud, water, and silence broken by animal calls and airboat engines. Rockstar's language is deliberate: this is a "primordial expanse" that resists human control.

Rockstar's description of Back Country Radio, one of six radio stations it previewed on October 8, 2026, says the station broadcasts to the Grassrivers, Port Gellhorn and beyond, and that its roving reporter and swamp meteorologist, Mud Dog Mike, checks in from the driver's seat of his Grassrivers airboat.

Wildlife

Grassrivers is the wildlife capital of Leonida. Rockstar says Leonida has over 170 animal species across land, air and sea; around 20 have been identified in the trailers and official screenshots so far, and many of them inhabit this region. The following species have been confirmed through official trailers, screenshots, and promotional materials.

Confirmed Animals

Birds Identified So Far

The Burmese Python is a particularly authentic touch. In real life, Burmese Pythons became an invasive species in the Florida Everglades starting in the 1990s after pet owners released them into the wild. Their population has grown into the tens of thousands, devastating native wildlife. The Florida Fish and Wildlife Conservation Commission runs an annual Python Challenge encouraging hunters to remove them. Grassrivers mirrors this real ecological crisis.

POACH

The Protection of Animals & Controlled Hunting (P.O.A.C.H.) is Leonida's wildlife enforcement agency. The acronym is an intentional joke: "poaching" means illegal hunting, which is exactly what the agency is supposed to prevent. Their logo has a goose inside a crosshair, doubling down on the irony.

POACH is based on the real-life Florida Fish and Wildlife Conservation Commission (FWC). In Trailer 1, a POACH employee is shown recovering an alligator from a Leonida resident's swimming pool. The scene is framed as a social media post from the handle "OfficialPOACH," functioning as a public warning to residents about alligator encounters.

POACH operates enforcement vehicles including a Bison pickup truck, a police SUV, and a helicopter. They pursue poachers and enforce wildlife regulations. Official screenshots show a pickup truck loaded with live alligators being chased by law enforcement through Grassrivers, suggesting POACH responds aggressively to poaching activity. The agency likely functions as a game warden system that activates when the player breaks hunting laws or disturbs protected areas.

Thrillbilly Mud Club

The Thrillbilly Mud Club is an outdoor off-road motorsports park; Rockstar has not said where in Leonida it is. It appears in Trailer 1 as an open, muddy, wet area near a forest with a wooden viewing platform at its center. NPCs are shown partying while covered in mud. Vehicles at the venue include ATVs, swamp buggies, and monster trucks.

The real-world inspiration is Redneck Mud Park in Punta Gorda, Florida, a recreational all-ages off-road facility that offers camping, ATV trails, and organized events. The Thrillbilly Mud Club represents GTA VI's take on the mud-bogging culture that is genuinely popular in rural Florida and throughout the American South.

Vehicles

Grassrivers has its own distinct vehicle ecosystem built around shallow-water navigation and rough terrain.

Airboats are the defining mode of transport in Grassrivers. Both confirmed models are designed for shallow water, capable of skimming across the flooded grasslands where conventional boats would run aground. The Airgator Airboat 09 appears in Rockstar's official screenshots being used for both alligator hunting and fishing, confirming it as a dual-purpose utility and recreational vehicle.

"Deadlier Predators"

Rockstar's description warns that alligators are "the most famous attraction, but there are far deadlier predators" in Grassrivers. This almost certainly carries a dual meaning.

On the animal side, confirmed wildlife beyond alligators includes Burmese pythons (which can grow over 20 feet in the real Everglades), cougars, wild boars, and venomous snakes. All of these are more stealthy or aggressive than alligators in certain contexts. A python ambush in tall grass or a cougar stalking the player through the mangroves would qualify as "deadlier" encounters.

On the human side, official screenshots show armed alligator hunters on airboats carrying assault rifles, and a truck full of poached alligators fleeing law enforcement. The people who live and operate in Grassrivers are armed, hostile, and outside the law. The "deadlier predators" are not just animals.

The phrase "weirder discoveries among the mangroves" remains entirely unspecified. It may refer to hidden structures, unusual characters, Easter eggs, or story elements that Rockstar has not yet revealed.

Activities

Story Connections

Jason Duval is shown operating in Grassrivers in Trailer 2, where he pilots a Buzzard Attack Chopper pursuing an Airgator Airboat 09 at approximately 2:18. This confirms that Grassrivers is directly part of gameplay missions involving the main protagonist, not just a side-activity zone.

The criminal activity visible in official Grassrivers footage (armed poachers, police pursuits, alligator trafficking) strongly suggests the region plays a role in the game's broader criminal underworld. The poaching and smuggling operations running through the swamp connect to the same criminal networks that operate across Leonida.

Real-World Inspiration

Rupert Humphries, Rockstar's senior vice president of narrative, said in a September 2026 magazine cover story that the team's research trips for the game included time in the Everglades, the real wetland that Grassrivers is modelled on.

Name Origin

The Grassrivers name predates this game: it was referenced in the in-game internet of an earlier entry in the series.

Comparison to Other Regions

Grassrivers occupies a unique ecological niche on the Leonida map. It is the game's only true wetland biome, distinct from the tropical islands of the Leonida Keys, the decaying suburban coast of Port Gellhorn, the industrial farmland of Ambrosia, and the forested highlands of Mount Kalaga National Park. Where Mount Kalaga has pine forests and clear mountain rivers, Grassrivers has murky swamp channels and mangrove thickets. The terrain is flat, wet, and hostile in a way that no other GTA VI region replicates.