The Tamar River narrows to thirty metres at the mouth of Cataract Gorge, where dolerite cliffs rise ninety metres above the waterline and the current accelerates through a geological fault older than the Tasmanian land bridge. Aboriginal Palawa people navigated these reaches for twelve thousand years before colonial surveyors charted the passage in 1804, naming the gorge for its cascade-strewn tributary rather than the river channel itself. The South Esk River carved the gorge over two million years, exposing columnar basalt formed during Jurassic volcanism and creating the only navigable freshwater canyon in Australia's temperate zone. Commercial passenger vessels began operating the route in 1891, when the stern-wheeler Lady of the Lake carried wool traders and holidaymakers upstream from Launceston's wharves to the picnic grounds at Duck Reach. The service lapsed during the Depression but resumed in 1972 with the launch of the timber-hulled Lady Launceston, a forty-two-seat vessel designed for the gorge's tight turning radius and shallow draft. The contemporary fleet includes both heritage-style cruisers and rigid-hull inflatables equipped for closer approaches to the cliff faces, all departing from Home Point Cruise Terminal on the river's western bank. The gorge functions as an ecological corridor linking the Tamar estuary to the Central Plateau, supporting platypus colonies, white-bellied sea eagles, and stands of blackwood acacia that predate European settlement. Tamar River cruise Cataract Gorge routes pass beneath the King's Bridge suspension span and the 1903 steel truss of the Alexandra Bridge before entering the gorge proper, where the walls close to form a natural amphitheatre. The twenty-minute upstream leg covers three kilometres, reaching the basin below First Basin Reserve where the South Esk converges with Cataract Creek. Return passages allow views of Launceston's northern suburbs rising above the floodplain and the Tamar Island Wetlands reserve at the river's tidal limit. The terminal operates daily from 09:30 to 16:30, with fifty-minute round-trip departures scheduled hourly during peak season and every ninety minutes in winter. Advance booking secures deck seating on the open upper level, where interpretation panels identify geological formations and navigation marks. The gorge remains the only section of the Tamar navigable year-round without tidal restrictions, its depth maintained by the South Esk's alpine catchment and the basalt bedrock that resists siltation.