The Atlantic bottlenose dolphin population along Georgia's barrier islands maintains year-round residence in the estuarine corridors between Savannah and Tybee Island, a 26-nautical-mile stretch of tidal rivers, salt marsh, and shallow sound that has supported cetacean pods for millennia. These waters, where the Savannah River meets the Atlantic, create a brackish nursery rich in mullet, menhaden, and shrimp — the dietary foundation that sustains between 200 and 300 individual dolphins catalogued by the Tybee Marine Science Center since 2004. Unlike migratory populations farther north, Tursiops truncatus here hunt, calve, and socialize within sight of Cockspur Island Lighthouse and the marshes of Little Tybee, their dorsal fins cutting the surface in predictable rhythms tied to tidal flux rather than seasonal migration. Savannah to Tybee dolphin cruise departures operate daily from Old U.S. Highway 80, where the barrier island's western shore meets the Back River channel. Vessels navigate the Lazaretto Creek estuary and swing south into Wassaw Sound, tracing the same routes shrimp trawlers have worked since the 18th century. Captains trained in marine mammalogy adjust course based on tide tables and sonar: dolphins feed most actively during the two hours surrounding flood tide, when baitfish concentrate against oyster banks. The cruises pass Fort Pulaski's brick casemates and the skeletal remains of turn-of-century fish camps, their pilings now roosts for brown pelicans and oystercatchers. The ecosystem's stability hinges on the salt marsh, which filters 1.5 billion gallons of tidal exchange daily and ranks among the most productive nurseries on the eastern seaboard. Spartina alterniflora meadows stretch unbroken for eleven miles, sheltering juvenile spotted seatrout and providing detrital matter that anchors the estuarine food web. Dolphin tours thread these channels under the supervision of NOAA Marine Mammal Protection Act guidelines, maintaining 50-yard buffer zones and limiting engine noise to preserve natural foraging behavior. The bottlenose dolphins themselves exhibit site fidelity rare among coastal cetaceans, with photo-identification studies documenting individuals returning to the same sandbars across two decades.