Folly Beach sits at the confluence of the Folly River and the Atlantic, where tidal currents carved a labyrinth of salt marsh and tidal creeks that shelter one of South Carolina's densest populations of Atlantic bottlenose dolphins. The island earned its name in the seventeenth century from English settlers who remarked on the folly of building so close to the shifting sandbars, yet those same sandbars created the shallow estuaries that today support oyster beds, egret rookeries, and the year-round dolphin pods that feed on mullet and menhaden in water rarely deeper than twelve feet. Morris Island Lighthouse, erected in 1876 and stranded 1,600 feet offshore after decades of erosion, serves as the navigational anchor for most folly beach boat tours. The 161-foot tower marks the northern boundary of the Folly River estuary, where captains idle engines to let passengers watch dolphins surface-feed in the slack tide. The lighthouse lost its lantern room to Hurricane Hugo in 1989, but its brick drum remains a roosting site for brown pelicans and a waypoint for shrimpers working the channels at dawn. The Folly River itself drains 23 square miles of marsh, creating a brackish corridor where salinity shifts with each tide cycle. Stand-up paddleboard safaris depart from the public landing at the island's northern tip, threading through cord grass islands where great blue herons nest in February and diamondback terrapins sun on mudflats in August. Charter captains time departures to the flood tide, when dolphins push baitfish into the narrowing creeks and passengers can drift within thirty feet of surfacing calves. Sunset departures align with the golden hour that photographers prize, when westward light rakes across the marshes and silhouettes the distant steeples of Charleston Peninsula. The Atlantic horizon turns amber between 7:15 and 8:00 PM in summer, and most evening cruises return as the Morris Island light begins its automated flash sequence — a five-second interval visible fourteen miles offshore. Operators hold permits from the South Carolina Department of Natural Resources and follow federal guidelines that mandate 50-yard standoff distances from marine mammals, though dolphins frequently approach vessels out of curiosity, breaching within arm's reach of the gunwales.