Sorel-Tracy is a city in southwestern Quebec, Canada and the geographical end point of the Champlain Valley. It is located at the confluence of the Richelieu River and the St. Lawrence River, on the western edge of Lac Saint-Pierre, downstream and northeast of Montreal. The population as of the Canada 2021 Census was 35,165. Its mayor is Patrick Péloquin and it is the seat of the Pierre-De Saurel Regional County Municipality and the judicial district of Richelieu.

The Richelieu River is a river of Quebec, Canada, and a major right-bank tributary of the St. Lawrence River. It rises at Lake Champlain, from which it flows northward through Quebec and empties into the St. Lawrence. It was formerly known by the French as the Iroquois River and the Chambly River, and was named for Cardinal Richelieu, the powerful minister under Louis XIII.