Canada is a country in the northern part 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 (3.85 million square miles), making it the world second-largest country by total area. Its southern and western border with the United States, stretching 8,891 kilometres (5,525 mi), is the worlds longest bi-national land border. Capital of Canada is Ottawa, and its three largest metropolitan areas are Toronto, Montreal, and Vancouver