Canada

is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean. It is the world's second largest country by total area, and shares land borders with the United States to the south and northwest.
The lands have been inhabited for millennia by aboriginal peoples. Beginning in the late 15th century, British and French expeditions explored and later settled the Atlantic coast. France ceded nearly all of its colonies in North America in 1763 after the Seven Years War. In 1867, with the union of three British North American colonies through Confederation, Canada became a federal dominion. A gradual process of independence from the United Kingdom moved Canada towards statehood and culminated in the Canada Act 1982, severing the last vestiges of dependence on the British parliament.
A federation now comprising ten provinces and three territories, Canada is a parliamentary democracy and a constitutional monarchy with Queen Elizabeth II as its head of state. It is a bilingual and multicultural country, with both English and French as official languages at the federal level. Technologically advanced and industrialized, Canada maintains a diversified economy that is heavily reliant upon its abundant natural resources and upon trade particularly with the United States, with which Canada has had a long and complex relationship.
Canada is a federation composed of ten provinces and three territories; in turn, these may be grouped into numerous regions, which predicate some aspects of Canadian governance, e.g., representation in the Senate. Western Canada consists of British Columbia and three Prairie provinces (Alberta, Saskatchewan, Manitoba). Eastern Canada consists of Central Canada (Quebec and Ontario) and Atlantic Canada (comprised of the three Maritime provinces of New Brunswick, Prince Edward Island, and Nova Scotia; and Newfoundland and Labrador). Three territories (Yukon, Northwest Territories, and Nunavut) comprise Northern Canada. Provinces have a large degree of autonomy from the federal government, territories somewhat less. Each has its own provincial or territorial symbols.
The provinces are responsible for most of Canada's social programs (such as health care, education, and welfare) and together collect more revenue than the federal government, an almost unique structure among federations in the world. Using its spending powers, the federal government can initiate national policies in provincial areas, such as the Canada Health Act; the provinces can opt out of these, but rarely do so in practice. Equalization payments are made by the federal government to ensure that reasonably uniform standards of services and taxation are kept between the richer and poorer provinces.
All provinces have unicameral, elected legislatures headed by a Premier selected in the same way as the Prime Minister of Canada. Each province also has a Lieutenant-Governor representing the Queen, analogous to the Governor General of Canada, appointed on the recommendation of the Prime Minister of Canada, though with increasing levels of consultation with provincial governments in recent years.
Canada occupies a major northern portion of North America, sharing land borders with the contiguous United States to the south and with the US state of Alaska to the northwest, stretching from the Atlantic Ocean in the east to the Pacific Ocean in the west; to the north lies the Arctic Ocean. By total area (including its waters), Canada is the second largest country in the world, after Russia, and largest on the continent. By land area it ranks fourth, after Russia, China, and the United States. Since 1925, Canada has claimed the portion of the Arctic between 60°W and 141°W longitude,but this claim is not universally recognized. The northernmost settlement in Canada and in the world is Canadian Forces Station (CFS) Alert on the northern tip of Ellesmere Island—latitude 82.5°N—just 817 kilometres (450 nautical miles) from the North Pole.Canada has the longest coastline in the world: 243,000 kilometres.
The population density, 3.5 inhabitants per square kilometre (9.1/sq mi), is among the lowest in the world.The most densely populated part of the country is the Quebec City-Windsor Corridor along the Great Lakes and Saint Lawrence River in the southeast.To the north of this region is the broad Canadian Shield, an area of rock scoured clean by the last ice age, thinly soiled, rich in minerals, and dotted with lakes and rivers. Canada by far has more lakes than any other country and has a large amount of the world's freshwater.

The Horseshoe Falls in Ontario is the largest component of Niagara Falls, one of the world's most voluminous waterfalls,a major source of hydroelectric power, and a tourist destination.
In eastern Canada, the Saint Lawrence River widens into the Gulf of Saint Lawrence, the world's largest estuary, that contains the island of Newfoundland. South of the Gulf, the Canadian Maritimes protrude eastward along the Appalachian Mountain range from northern New England and the Gaspé Peninsula of Quebec. New Brunswick and Nova Scotia are divided by the Bay of Fundy, which experiences the world's largest tidal variations. Ontario and Hudson Bay dominate central Canada. West of Ontario, the broad, flat Canadian Prairies spread toward the Rocky Mountains, which separate them from British Columbia.
In western Canada, the Mackenzie River flows from the Arctic Ocean to the Great Slave Lake. A tributary of a tributary of the Mackenzie is the South Nahanni River, which is home to Virginia Falls, a waterfall about twice as high as Niagara Falls.