“Half of Canada’s 33.5 million people live in the red part, the other in the yellow. More population divided maps (Source: reddit.com)”

Source: mapsontheweb.zoom-maps.com

Land-wise, Canada one of the world’s biggest countries, but population-wise, most of it is quite barren.  What geographic factors explain the population concentration and distribution in Canada?  

TagsCanada, map, North America.