The Coorong's 130-kilometre ribbon of saltwater lagoons was carved from the Southern Ocean by millennia of littoral drift — a coastal geomorphology so singular that the narrow peninsula sheltering it, the Younghusband, appears on satellite imagery as a thread dividing two blues. European navigators charted the Murray Mouth in 1830, but the wetlands sustained Ngarrindjeri communities for forty thousand years, their fish traps and middens still visible along tidal channels that pulse twice daily with ocean water. Today the Coorong holds Ramsar Convention status, protecting over two hundred bird species that converge here during southern hemisphere migration routes. Australian pelicans — wingspans exceeding two and a half metres — roost in colonies of five thousand, their breeding synchrony timed to freshwater pulses from the Murray-Darling Basin. Coorong scenic cruise with lunch departures trace the river's final twelve kilometres, where amber water meets salt and mangrove-lined banks give way to open lagoon. Vessels navigate shallow drafts that rise and fall with tide windows, the only access to wetlands unreachable by road. The Murray Mouth itself migrates — sandbars shift seasonally, and dredging operations since 2002 maintain a navigable channel that once closed entirely during drought. Onboard naturalist commentary unpacks this hydraulic tension: the river system's health depends on annual flooding that no longer arrives predictably, and salinity gradients have crept upstream, altering fish nurseries that once fed commercial fisheries. Passengers sight black swans, sharp-tailed sandpipers and occasionally the Coorong's remnant population of hooded plovers, a species now confined to undisturbed beach edges. Goolwa Wharf Precinct, the embarkation point for Coorong boat tours with lunch, occupies reclaimed riverfront where paddle-steamers once queued to offload wool bales bound for Adelaide. Historic iron mooring posts still punctuate the promenade. Modern aluminium-hulled vessels depart daily except during king tides or gale warnings, their shallow keels designed for lagoon navigation that larger craft cannot attempt. Onboard lunch service — local seafood, Fleurieu Peninsula produce — is timed to pelican feeding schedules at designated lagoon anchorages, where flocks converge within arm's reach of the rail.