Brisbane Water is a wave-dominated barrier estuary forming a significant tidal waterway on the Central Coast of New South Wales. It originates at the confluence of Narara and Coorumbine Creeks near Gosford and flows approximately 18 kilometers south to its mouth at Broken Bay, which opens to the Tasman Sea. The estuary encompasses a total catchment area of about 165 square kilometers and features a complex shoreline with numerous bays, inlets, and islands, including St Huberts Island and Pelican Island. It is bordered by suburbs and towns such as Gosford, Woy Woy, Davistown, Ettalong Beach, and Saratoga, with Brisbane Water National Park and Bouddi National Park adjoining its western and eastern shores, respectively. The estuary is characterized by scenic value, pristine vegetation in areas, and extensive mangrove systems, particularly around Woy Woy and Davistown. It is a premier destination for a variety of water-based activities, with fishing being a major draw due to its productive and diverse marine environment.