Nymboida Coutts Water, The Harness Cask[1]
Nymboida River, 2008
Location
Country	Australia
State	New South Wales
Region	NSW North Coast (IBRA), Northern Rivers
Local government areas	Bellingen, Clarence Valley
Physical characteristics
Source	Barren Mountain, Great Dividing Range
• location	Bellinger River National Park
• elevation	1,370 m (4,490 ft)
Mouth	confluence with the Mann River
• location	below Mount Gundahl, within the Nymboida National Park
• elevation	119 m (390 ft)
Length	165 km (103 mi)
Basin features
River system	Clarence River catchment
Tributaries
• left	Allans Water, Blicks River, Clouds Creek, Boyd River
• right	Deer Park Creek, Little Murray River, Bielsdown River, Wild Cattle Creek, Little Nymboida River, Boundary Creek
National parks	Bellinger River NP, Nymboida NP, Nymboi-Binderay NP
[2]

The Nymboida River, a perennial stream of the Clarence River catchment, is located in the Northern Rivers region of New South Wales, Australia.

The Nymboida River rises in the northern foothills of the Barren Mountain, on the slopes of the Great Dividing Range, within Bellinger River National Park, west of Dorrigo. Annual high rainfall on the Dorrigo Plateau produces strong river flows during most seasons. The river flows in a meandering course generally northeast, joined by nine tributaries including the Little Murray, Bielsdown, Blicks, Little Nymboida, and Boyd rivers, before reaching its confluence with the Mann River, below Mount Gundahl, within the Nymboida National Park.^[3] The river descends 1,250 metres (4,100 ft) over its 165-kilometre (103 mi) course.^[2]

Flowing through Nymboi-Binderay National Park from Platypus Flat to The Junction confluence with the Little Nymboida River, there is a 27-kilometre (17 mi) section of rapid and pool sequences, making this a popular kayaking and white water rafting venue. Located 13 kilometres (8.1 mi) from the source is Rob Roys Falls, a 90-metre (300 ft) cascade while further down river lies The Silent Pool, a geological mystery where the river goes underground via a fault line and returns under a large pool.^{[citation needed]}

The river is also a stronghold for the endangered Eastern Freshwater cod where it is quite common in several reaches.

Until 2012 waters released from the hydro-electric power station on the Nymboida River created one of Australia's most difficult canoe courses and as such was the site of many kayaking and canoeing competitions. Several companies offer organised rafting trips on the river.^[4]

• Rivers of New South Wales

29°39′S 152°30′E / 29.650°S 152.500°E / -29.650; 152.500