River Tamar, located in northern Tasmania, Australia, is a 70‑kilometre tidal estuary formed by the confluence of the North Esk and South Esk rivers at Launceston. Visitors can enjoy sightseeing cruises, recreational boating, and fishing along its sheltered waters. Notably, the Batman Bridge provides the only full crossing, while the Low Head Lighthouse marks its mouth at Bass Strait, and the river’s history includes unique engineering schemes and ship sinkings to manage silting.