The Dumont River flows entirely in the municipality of Chesterville, in the Arthabaska Regional County Municipality (MRC), in the administrative region of Centre-du-Québec, in Quebec, in Canada.

The neighboring hydrographic slopes of the Dumont River are: The "Dumont River" has its source in a mountainous area at 1.8 kilometres (1.1 mi) north of the village of Chesterville in the municipality of Chesterville, between two mountains (summit of 300 metres (980 ft) to the west and 482 metres (1,581 ft) to the east).

The Dumont river flows on 4.1 kilometres (2.5 mi) according to the following segmentsː The Dumont River empties on the northeast shore of the Nicolet River at 1.4 kilometres (0.87 mi) southwest of the center of the village of Chesterville.

The term "Dumont" constitutes a family name of French-speaking origin.

The toponym "rivière Dumont" was made official on September 5, 1985, at the Commission de toponymie du Québec.