This area is located 1.5 kilometres (0.93 mi) east of the municipality boundary of Saint-Sébastien and 2.1 kilometres (1.3 mi) north of the limit of the municipality of Lac-Drolet.

Its confluence is located 4.7 kilometres (2.9 mi) (or 3.4 kilometres (2.1 mi) in a direct line) downstream from the mouth of the Drolet River and upstream from the bridge of Saint-Ludger.

Until recently, maps designated this watercourse under the toponym “Eugenie River”.

The English pronunciation of the first name would have led to the spelling "Ludgine".

[2] The toponym “Rivière Ludgine” was made official on January 31, 1980, at the Commission de toponymie du Québec.