Manning River (Biripi: Boolumbahtee), an open and trained mature wave dominated barrier estuary, is located in the Northern Tablelands and Mid North Coast districts of New South Wales, Australia. It is the only double delta river in the southern hemisphere in which there are two permanent entrances to the river, one at Old Bar and another at Harrington, and is famously one of only two rivers in the world to have permanent multiple entrances with the other being the Nile river in Egypt.
Manning River rises below Mount Barrington, on the northeastern slopes of the Great Dividing Range within Barrington Tops National Park, east southeast of Ellerston, and flows generally southeast, joined by eleven tributaries including the Pigna Barney, Barnard, Nowendoc, Gloucester, Dawson, and Lansdowne rivers, descending 1,500 metres over its 261-kilometre course from the high upper reaches, through the Manning Valley, and out to sea.
