Welcome to the Leonida Keys: Causeway Bottlenecks, Coral Reefs & Smuggler Marinas

Life in Mariana County looks casual in flip-flops and tiki bars — until Coast Guard cutters and cartel speedboats meet beyond the reef.
Linked to the mainland via sweeping over-water bridges including the Card Sound Bridge analog, Mariana County’s tropical island chain — the Leonida Keys — serves as Jason Duval’s home turf and the maritime gateway of the state.

One Highway In, Endless Ocean Out
Geographically, the Keys Causeway creates one of the tensest tactical bottlenecks in Grand Theft Auto history: kick up five-star heat in Key Lento and highway roadblocks can trap land vehicles instantly, forcing daring escapes by speedboat, SeaShark, or seaplane across shallow turquoise sandbars.


