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The Grassrivers is the wild swamp at the south of Leonida, a vast Everglades-inspired wetland of mangroves, sawgrass, and slow brown water. Alligators are the famous draw, but Rockstar warns of far stranger and deadlier things hiding in the mud. Already appeared in a previous chapter of the series (GTA V): The wetland region is located in the southern portion of the State of Leonida, and is currently known to run through Vice-Dale County and Mariana County. It was first mentioned in Grand Theft Auto IV on Leftover-vacations.com in a Vice City travel advertisement, and on Craplist.net by a tourist who smuggled a crocodile from Vice City's wetland border to Liberty City. The region was then mentioned by name in the September 2022 GTA VI leaks on an educational interpretive sign titled "Energy in the Grassrivers", which explained the ecosystem of the Grassrivers. The Grassrivers later officially appeared in the game's first trailer in two consecutive shots: one showing an airboat traversing the region (0:19) and another featuring a large flamboyance of flamingos along with multiple alligators (0:20).