Toronto is the provincial capital of Ontario and the largest city in Canada. It is located in Southern Ontario on the northwestern shore of Lake Ontario. With over 2.5 million residents, it is the fifth most populous city in North America. Its metropolitan area with over 5 million residents is the seventh largest urban region in North America. Toronto is at the heart of the Greater Toronto Area (GTA), and is part of a densely populated region known as the Golden Horseshoe, which is home to over 8.1 million residents—approximately 25% of Canada's population.