Canada is a country in the northern half of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering 9.98 million square kilometres, making it the world's second-largest country by total area and the fourth-largest country by land area. Canada's border with the United States is the world's longest land border. One third of the population lives in the three largest cities: Toronto, Vancouver and Montreal. Its capital is Ottawa and other major urban areas include Calgary, Edmonton, Quebec City, Winnipeg and Hamilton.