London is a city in Southwestern Ontario, Canada, situated along the Quebec City–Windsor Corridor. The city has a population of 366,151 according to the 2011 Canadian census. London is the seat of Middlesex County, at the forks of the non-navigable Thames River, approximately halfway between Toronto, Ontario and Detroit, Michigan. The City of London is a separated municipality, politically separate from Middlesex County, though it remains the official county seat.