The provinces and territories of Canada combine to make up the world's second-largest country by area. In 1867, three provinces of British North America—New Brunswick, Nova Scotia and the Province of Canada (which, on the formation of Canada, was divided into Ontario and Quebec)—were united to form the new nation. Since then, Canada's external borders have changed several times, and the country has grown from the original four provinces to ten provinces and three territories. The ten provinces are Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, Quebec, and Saskatchewan. The three territories are Northwest Territories, Nunavut, and Yukon.