The Bras Saint-Michel is a tributary of the north-west bank of the Rivière du Sud (Montmagny) which flows north-east to the south bank of the St. Lawrence River, in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.

[1] The "Bras Saint-Michel" crosses the MRC of: The Saint-Michel arm has its source in the municipality of Saint-Henri at 3.8 kilometres (2.4 mi) west of the center of the village of Saint-Gervais, at 7.9 kilometres (4.9 mi) north of the center of the village of Saint-Anselme and at 9.5 kilometres (5.9 mi) east of center of the village of Saint-Henri.

This spring is located in an agricultural zone north of the Boyer River and northwest of the first rang West road.

The "Bras Saint-Michel" flows relatively in a straight line north-east in parallel (on the south-east side) over the Boyer river.

[1] The toponym "Bras Saint-Michel" was made official on December 5, 1968, at the Commission de toponymie du Québec.