The Savannah River estuary supports one of the Atlantic coast's densest populations of bottlenose dolphins—researchers estimate 200 resident individuals navigate the twelve miles of tidal waterway between the Port of Savannah and Tybee Island's barrier beaches. These coastal cetaceans feed on spot-tail bass and mullet concentrated along oyster banks and spartina cordgrass marshes, surfacing most predictably in the hour before sunset when thermal stratification drives baitfish toward the surface. Commercial sunset dolphin cruise Savannah GA operations launched in the early 1990s aboard converted shrimp trawlers, but modern eco-cruise vessels now deploy low-wake hulls and elevated observation decks designed to minimize disturbance while maximizing sightline angles across the river's two-mile width. Captains follow voluntary standoff protocols established by the Gray's Reef National Marine Sanctuary, maintaining 50-yard distances and cutting engines when dolphins approach voluntarily. The river's six-foot tidal range creates predictable feeding corridors along channel markers and submerged sandbars, particularly near the confluence with Elba and Middle rivers where salinity gradients concentrate prey species. Evening departures coincide with the golden hour, when low-angle sunlight illuminates the river's surface and backlights the dolphins' dorsal fins in high contrast. Naturalist guides onboard interpret surfacing patterns—single blows indicate foraging behavior, synchronized group rolls suggest coordinated hunting, and tail slaps signal territorial communication. The cruises traverse historic shipping lanes flanked by Fort Pulaski's nineteenth-century masonry and Cockspur Island's lighthouse, then turn seaward past dredge spoil islands now colonized by nesting egrets and wood storks. Autumn months bring peak dolphin activity as pods consolidate before winter dispersal, while summer departures extend into twilight as Civil War-era maritime infrastructure emerges in silhouette against the coastal plain's flat horizon.