Alberta is a province in central Canada. It is part of the Prairie provinces, located on the Canadian prairie. It is sparsely populated, having just over 3 million people, but is the most populous prairie province. Most people live in the southern half of the province. The terrain is mostly flat, dominated by glacial lakes and prairies. Alberta's economy has grown at a faster rate in recent years, thanks to the development of the Athabasca oil sands. The Calgary-Edmonton corridor, containing most of Alberta's population, is the largest conurbation in western Canada. The largest city is Calgary, with over 1 million people. The metro area of Edmonton, the capital, also has a population of about 1 million.