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 with Alaska to the northwest.

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, just 817 kilometers from the North Pole. Canada has the longest coastline in the world: 243,000 kilometers.

The population density, 3.5 inhabitants per square kilometer (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.