|North Arm Tweed River|
|Name origin: In honour of Henry John Rous|
|State||New South Wales|
|Regions||NSW North Coast (IBRA), Northern Rivers|
|Local government area||Tweed|
|Part of||Tweed River catchment|
|- left||Crystal Creek (Rous), Nobbys Creek|
|- right||Hopkins Creek, Jacksons Creek (New South Wales)|
|Source||Mount Hobwee, McPherson Range|
|- location||near Numinbah|
|- elevation||217 m (712 ft)|
|Mouth||confluence with the Tweed River|
|- elevation||0 m (0 ft)|
|Length||44 km (27 mi)|
|Nature reserve||Limpinwood Nature Reserve|
Course and features 
Rous River rises below Mount Hobwee on the southern slopes of the McPherson Range, near Numinbah on the New South Wales-Queensland border, and flows generally east by south, and then east, joined by four minor tributaries, before reaching its confluence with the Tweed River at Tumbulgum, northeast of Murwillumbah. The river descends 217 metres (712 ft) over its 44 kilometres (27 mi) course.
In its upper reaches, Rous River is fed by a minor tributary, Hopkins Creek, on the southern slopes of the McPherson Range, south of Mount Merino; and downriver of Numinbah near the small villages of Chillingham, Jacksons Creek enters the river. In its lower reaches, Rous River is fed by two minor tributaries, Nobbys Creek and Crystal Creek that emerge from the Numinbah Nature Reserve, south of Springbrook.
Adjustments to the natural flow of the river 
In January 2006, partially treated sewerage entered the river from emergency tanks and ponds after storage at the Murwillumbah treatment plant, which had been off-line due to damage, was filled beyond capacity. Biological testing indicated the river water was hazardous which led to a temporary swimming ban.
In 2007, the federal government proposed damming the Rous River, Oxley River and Byrill Creek. Local opposition to the plan was formed via the Save the Caldera Rivers Campaign, in an effort to stop the proposed dams from being built.
See also 
- "Rous River: 50370". Geographical Names Register. Geographical Names Board of New South Wales. 4 January 1974. Retrieved 2 March 2013.
- "Map of Rous River, NSW". Bonzle Digital Atlas of Australia. Retrieved 2 March 2013.
- NRMA (1998). NSW Northern Rivers & South-East Queensland (Map). 1:550,000. Cartography by Auslig (2 ed.). Ballina to Tweed Heads inset.
- "Treated sewerage flows to Rous River". ABC News. Australia: Australian Broadcasting Corporation. 6 January 2006. Retrieved 28 July 2009.
- "Rous River swim ban over". ABC News. Australia: Australian Broadcasting Corporation. 18 January 2006. Retrieved 28 July 2009.
- "Committee wants more time for say on dam plans". ABC News. Australia: Australian Broadcasting Corporation. 25 May 2007. Retrieved 28 July 2009.