Gregory River

Gregory
River
Name origin: In honour of Augustus Gregory
Country	Australia
Territory and State	Northern Territory, Queensland
Part of	Nicholson River catchment
Source	Barkly Tableland
- elevation	263 m (863 ft)
Mouth	Nicholson River
- location	southwest of Burketown, Queensland
- elevation	11 m (36 ft)
- coordinates
Length	321 km (199 mi)
Basin	24,179 km2 (9,336 sq mi)
Location of Gregory River mouth in Queensland

The Gregory River 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, one of the few permanently flowing rivers in the northwest of Queensland.

Course and features

The headwaters of the river rise on the north-eastern section of the Barkly Tableland 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 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. 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.

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. The area on the Barkly Tableland is made up of dissected limestone-dolomite slopes, canyons and plateaus.

The river has a mean annual flow of with minimum flow of recorded in 1984-85 and a maximum flow of recorded in 1973-74. 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.

The river is surrounded by forested areas on the upper reaches, with riparian woodlands and open savannah on the plains. Grasslands are made up of Astrebla pectinate and Eulalia fulca that grow on the heavy grey pedocals. Fringing forest is made up of a mix of Corymbia papuana, Eucalyptus tectifica and Eucalyptus microtheca.

History

The river is named in honour of Augustus Gregory, at the time the Queensland Surveyor General and an explorer. It was named by the first European to discover the river, William Landsborough, who came across it during of his 1861 expedition to find the lost Burke and Wills expedition. Landsborough found the river while traveling from Burketown and followed it all the way to the Barkly Tableland.

See also

• List of rivers of the Northern Territory
• List of rivers of Queensland