Gwydir River

Gwydir River (Guida)
Big Bundarra River, Bundara River, Big River, Rocky River
Major perennial river
Gwydir River, near Bingara
Name origin: In honour of Lord Gwydir
Country	Australia
State	New South Wales
IBRA	Northern Tablelands
Districts	New England, North West Slopes, Orana
Municipalities	Uralla, Gwydir, Moree Plains, Walgett
Part of	Barwon River, Murray–Darling basin
Tributaries
- left	Horton River
- right	Moredun Creek
City	Moree
Primary source	Rocky River
- location	at Yarrowyck, near Uralla
- elevation	760 m (2,493 ft)
Secondary source	Boorolong Creek
Source confluence	Mehi River
- location	near Moree
- elevation	202 m (663 ft)
Mouth	confluence with the Barwon River
- location	north east of Collarenebri
- elevation	144 m (472 ft)
Length	488 km (303 mi)
Basin	26,588 km2 (10,266 sq mi)
Discharge
- average	26 m3/s (918 cu ft/s)
Reservoirs	Lake Copeton, Collymongle Lagoon

Gwydir River /ɡhwˈdˈər/, a major inland perennial river of the Barwon catchment within the Murray-Darling basin, is located in the Northern Tablelands, North West Slopes, and Orana districts of New South Wales, Australia.

The river rises at the junction of the Rocky River and Boorolong Creek, at Yarrowyck, northwest of Uralla and flows generally northwest and west, joined by over thirty-four tributaries, including the Horton and Mehi rivers, before reaching its confluence with the Barwon River, north east of Collarenebri; descending 616 metres (2,021 ft) over its 488 kilometres (303 mi) course.

The flow of the river is impounded by Copeton Dam, with storage used for town water supply, stock, domestic use and irrigation. The Gwydir River below Copeton Dam provides some of the wildest whitewater rafting available in Australia. Before the construction of Copeton Dam and much diversionary work, the Gwydir River flowed into the Gingham and Lower Gwydir Wetlands.