The "Drolet River" flows in the municipality of Lac-Drolet, in the Le Granit Regional County Municipality (MRC), in the administrative region of Estrie, in Quebec, in Canada.

The resort is developed especially on the southwest shore and the northern part.

From the mouth of Drolet Lake, the Drolet river flows over 9.8 kilometres (6.1 mi) divided into the following segments: The Drolet River empties on the west bank of the Chaudière River in the municipality of Lac-Drolet in the place called "Puits de Jacob".

Its confluence is 0.9 kilometres (0.56 mi) west of route 204, upstream of the bridge in the village of Saint-Ludger and downstream of the intermunicipal boundary between Sainte-Cécile-de-Whitton and Lac-Drolet.

The toponym "rivière Drolet" was made official on December 5, 1968, at the Commission de toponymie du Québec.