Toronto is a city in southern Ontario, Canada. Located on the northwestern shore of Lake Ontario, it is the home of the provincial government, the largest city in Canada and the fifth largest city in North America. As of the 2006 Canadian census, the city's population is 2,503,281 and its census metropolitan area (CMA) has a population of 5,113,149. Toronto is known to be the most multicultural city in the world, with the United Nations designating Toronto as the "most ethnically-diverse city" five times in a row.