Canada's population density, at , is among the lowest in the world. Canada spans latitudinally from the 83rd parallel north to the 41st parallel north, and approximately 95 percent of the population is found south of the 55th parallel north. About four-fifths of the population lives within  of the border with the contiguous United States. The most densely populated part of the country, accounting for nearly 50 percent, is the Quebec City–Windsor Corridor in Southern Quebec and Southern Ontario along the Great Lakes and the Saint Lawrence River. An additional 30 percent live along the British Columbia Lower Mainland and the Calgary–Edmonton Corridor in Alberta.