Toronto is the largest city in Canada and the provincial capital of Ontario. It is located on the north-western shore of Lake Ontario. With over 2.5 million residents, it is the fifth most populous municipality in North America. Toronto is at the heart of the Greater Toronto Area (GTA), and is part of a densely populated region in south-central Ontario known as the Golden Horseshoe, which is home to 8.1 million residents and has approximately 25% of Canada's population. The census metropolitan area (CMA) had a population of 5,113,149, and the Greater Toronto Area had a population of 5,555,912 in the 2006 Census.