1989 Map of Dry Tortugas

About this map

Fort Jefferson National Monument stands as the central landmark of this late-century bathymetric and topographic survey, situated within the remote waters of the Gulf of Mexico. The map details the complex maritime geography at the western edge of the Florida Keys, where the shallow flats of The Quicksands meet deeper oceanic features. This dual-purpose chart illustrates the transition from terrestrial points like the Marquesas Keys to underwater formations such as the Pourtales Escarpment and Tortugas Bank. Navigational and conservation priorities are evident in the inclusion of the Key West National Wildlife Refuge and the delineation of the Three League Line. For maritime historians, the survey provides precise locations for hazardous seafloor features including Rebecca Shoal, Isaac Shoal, and Coalbin Rock, reflecting the area's long-standing importance to Caribbean shipping lanes.