Brisbane Water is a wave-dominated barrier estuary located in the Central Coast region, north of Sydney, New South Wales, Australia. Brisbane Water has its origin at the confluence of the Narara and Coorumbine Creeks, to the south–east of Gosford and travels for approximately in a southerly direction to its mouth at Broken Bay, about from the Tasman Sea, at Barrenjoey Head. A number of towns and suburbs surround the shores of Brisbane Water, including Blackwall, Booker Bay, Davistown, Empire Bay, Erina, Ettalong Beach, Gosford, Green Point, Hardys Bay, Kilcare, Kincumber, Koolewong, Phegans Bay, Point Frederick, Point Clare, Saratoga, Tascott, Wagstaffe, and Woy Woy. Contained within Brisbane Water is St Huberts Island, Rileys Island, and Pelican Island; and adjoining the estuary is Brisbane Water National Park to the west and Bouddi National Park to the east. Forming part of the same tidal estuary system is a separate but connected basin, the Kincumber Broadwater, lying to the east of Davistown.