Rockridge is a confirmed Vice-Dale County location on the Leonida map, one of many named spots inside Rockstar's version of Miami-Dade. No official description or specific real-world match has been released for it yet. The name is worth noting against real Miami-Dade geography. Much of the county sits low and flat, built over former wetland, but a limestone ridge known locally as the Miami Rock Ridge runs through the area and forms the high ground the city itself is built on. Whether that geological name is what Rockridge is echoing has not been confirmed anywhere, but the coincidence fits a county otherwise defined by water pressing in on every edge. Nothing further has been said about what the area contains or how players will use it. No trailer, screenshot or verified leak has shown it directly.
The community companion for Grand Theft Auto VI. Database, maps, guides and tools for Vice City and the state of Leonida.