city, Montréal region, southern Quebec province, Canada, on Île de Montréal (Montreal Island). It is a southwestern suburb of Montreal city facing Lac Saint-Louis, an extension of the St. Lawrence River. Offshore to the south is Île Dorval, a summer resort. Montréal-Pierre Elliott Trudeau International Airport, located in Dorval, is a major international passenger airport. The area was settled by the Sulpicians, a society of French priests who built a fort and mission on the site about 1670. The community was named for Jean Baptiste Bouchard (called Dorval), a French landowner. Inc. town, 1903; city, 1956. Pop. (2006) 18,088.