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The headwaters of the Namoi, including the Macdonald River, the Peel River, the Cockburn River and the Manilla River, rise on the western slopes of the Great Dividing Range on the Northern Tablelands, New South Wales. Other smaller tributaries include Cobrabald River, Coxs Creek, Maules Creek, Mooki River and Bundock Creek. It rises east of Niangala and flows generally north west after its confluence with its major tributary, the Cobrabald River, then passes through the villages of Woolbrook and Bendemeer. It continues to flow westward to where it changes name to the Namoi River at Boundary Creek just east of where the river enters Warrabah National Park.
The Namoi flows past Manilla and joins the Manilla River near the town. After passing into Keepit Dam it joins the Peel River below before passing by Carroll, then joining the Mooki River near Gunnedah on the Liverpool Plains. From here it flows north-westwards past Boggabri, Narrabri, Wee Waa and Burren Junction and eventually joins the Barwon River, near the town of Walgett.
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