|Etymology||Aboriginal: valley of plenty|
|State||New South Wales|
|Region||South Eastern Highlands (IBRA), Monaro|
|Municipality||Snowy Monaro Regional Council|
|⁃ location||east of Nimmitabel|
|⁃ coordinates||36°30′27″S 149°25′20″E|
|⁃ elevation||1,070 m (3,510 ft)|
|north of Cooma|
|706 m (2,316 ft)|
|Length||94 km (58 mi)|
|River system||Murrumbidgee catchment,|
|⁃ left||Kybeyan River, Big Badja River|
|⁃ right||Rock Flat Creek|
The name of the river is claimed to derive from an Aboriginal word meaning "valley of plenty", but Flavia Hodges has called this etymology "highly suspect."
The river rises on the northern slopes of the Great Dividing Range, about 12 kilometres (7.5 mi) east of the village of Nimmitabel, and flows generally north and west, joined by eight tributaries including the Kybeyan and Big Badja rivers before reaching its confluence with the Murrumbidgee River, south of Bredbo and about 18 kilometres (11 mi) north of Cooma; descending 367 metres (1,204 ft) over its 93-kilometre (58 mi) course.
The river is a diverse ecosystem rich with many different animal species such as the uncommonly seen Wanderer's Kingfisher and the Kiora frog. Its native freshwater fish fauna had been entirely replaced by introduced trout species, now replaced by the introduced European carp species; a common situation in south-east Australia.
- "Numeralla River". Geographical Names Register (GNR) of NSW. Geographical Names Board of New South Wales. Retrieved 13 January 2013.
- "Numeralla". Geographical Names Register (GNR) of NSW. Geographical Names Board of New South Wales. Retrieved 13 January 2013.
- "Map of Numeralla River, ACT". Bonzle Digital Atlas of Australia. Retrieved 13 January 2013.
- "History". Numeralla and District Activities Inc. 2010. Retrieved 13 January 2013.