Sorel-Tracy is a city in southwestern Quebec, Canada and the geographical end point of the Lake Champlain Valley at the confluence of the Richelieu River and the St. Lawrence River, on the western edge of Lac Saint-Pierre downstream and east of nearby Montreal. The population as of the Canada 2011 Census was 34,600. Its mayor is Réjean Dauplaise and it is the seat of the Pierre-De Saurel Regional County Municipality and the judicial district of Richelieu.