Le Petit Chenail (English: The Little Chenail) connects the west bank of the Yamaska River and the south bank of the Rivière Pot au Beurre, thus forming the Île du Domaine (length: 6.3 kilometres (3.9 mi) in a north–south direction; maximum width: 1.6 kilometres (0.99 mi)) in the municipality of Yamaska in the Pierre-De Saurel Regional County Municipality (MRC), in the administrative region of Montérégie, on the South Shore of Saint Lawrence River, in Quebec, Canada.

The main hydrographic slopes near the "Petit Chenail" are: The Petit Chenail is mainly fed by the Saint-Louis River (coming from the west).

The northern part of the channel crosses 1.7 kilometres (1.1 mi) a marsh area to the lower part of the Rivière Pot au Beurre.

[1] Le Petit Chenail connects to the Yamaska River at 2.4 kilometres (1.5 mi) downstream from the Camille-Parenteau Bridge crossed by route 132 and at 3.7 kilometres (2.3 mi) upstream of the southern tip of Île Saint-Jean.

[1] The toponym "Le Petit Chenail" was officially registered on January 21, 1975, at the Commission de toponymie du Québec.