The Upaunan River is a tributary of the Enistustikweyach River in Regional County Municipality (RCM) of Eeyou Istchee James Bay (municipality) in the administrative region of the Nord-du-Québec, in Canadian province of Quebec, in Canada.

The Upaunan River hydrographic slope has no access road nearby; however, the northern route from Matagami passes to 26.3 kilometres (16.3 mi) west of the mouth of the Upaunan River.

The surface of the river is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.

The main hydrographic slopes near the Upaunan River are: The Upaunan River has its source of a stream (elevation: 269 metres (883 ft)) surrounded by marshes and located at: From its source, the "Upaunan River" flows on 17.1 kilometres (10.6 mi) according to the following segments: Of Cree origin, the toponym "Upaunan River" means: "the river of the camp of the pass".

The toponym "Upaunan River" was formalized on October 5, 1982 at the Commission de toponymie du Québec[3] Download coordinates as: