|Etymology||Aboriginal: "grass seeds"|
|State||New South Wales|
|Region||NSW North Coast (IBRA), Upper Hunter|
|Local government area||Upper Hunter|
|Source||Great Dividing Range|
|⁃ location||Oxleys Peak|
|⁃ elevation||475 m (1,558 ft)|
|Mouth||confluence with the Goulburn River|
|below Mount Kerrabee|
|158 m (518 ft)|
|Length||78 km (48 mi)|
|River system||Hunter River catchment|
|⁃ left||Coulsons Creek, Butchers Swamp Creek, Vallances Creek, Horse Creek (New South Wales), Kittens Creek|
|⁃ right||Gummum Creek, Farm Springs Creek, Scrubby Creek|
|National park||Goulburn River NP|
Course and features
Merriwa River rises on the southern slopes of the Great Dividing Range, below Oxleys Peak, north of Merriwa and flows generally south, joined by eight minor tributaries before reaching its confluence with the Goulburn River below Mount Kerrabee. The river descends 317 metres (1,040 ft) over its 78 kilometres (48 mi) course.
At the town of Merriwa, the Golden Highway crosses the Merriwa River.
Merriwa is thought to be derived from the Aboriginal word meaning "grass seeds."
- "Merriwa River". Geographical Names Register (GNR) of NSW. Geographical Names Board of New South Wales. Retrieved 1 April 2013.
- "Travel: Merriwa". The Sydney Morning Herald. 8 February 2004. Retrieved 1 April 2013.
- "Map of Merriwa River, NSW". Bonzle Digital Atlas of Australia. Retrieved 1 April 2013.