The Gregory River (Waanyi: Ngumarryina) is a river located in the Northern Territory and the state of Queensland, Australia. The river is the largest perennial river in arid and semi-arid Queensland,[2][3] one of the few permanently flowing rivers in the northwest of Queensland.
The headwaters of the river rise on the north-eastern section of the Barkly Tableland[4] in the Northern Territory, in an area of gently undulating downs country dominated by cattle stations. The river is fed by springs in shallow valleys[5] and it then flows eastwards through an area of well developed canyons in Queensland. The river is joined by one of its major tributaries, the O’Shanassy River, a little downstream of Riversleigh.[6] Another main tributary Lawn Hill Creek discharges into the Gregory further downstream of Gregory Downs. The Gregory discharges into the Nicholson River to the southwest of Burketown, having descended 252 metres (827 ft) over its 321-kilometre (199 mi) course.[1]
The river has a catchment area of approximately 24,179 square kilometres (9,336 sq mi) and is part of the 52,234 square kilometres (20,168 sq mi) Nicholson River catchment.[2] The area on the Barkly Tableland is made up of dissected limestone-dolomite slopes, canyons and plateaus.[2]
The river has a mean annual flow of 694 gigalitres (1.53×1011 imp gal; 1.83×1011 US gal) with minimum flow of 123 GL (2.7×1010 imp gal; 3.2×1010 US gal) recorded in 1984–85 and a maximum flow of 3,701 GL (8.14×1011 imp gal; 9.78×1011 US gal) recorded in 1973–74.[2] A number of wetlands of national significance are found within the catchment. These include the 26,639 hectares (65,826 acres) Gregory River wetland and the 298,888 hectares (738,568 acres) Thorntonia Aggregation.[2]
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