Nations by size. See large
Seeing as we all walked out of Africa and spread, borders are inherently illusory. So, as a thought experiment, this map has been circulating which shows nations given new land based on population. India, for example, gets to occupy Canada while Canada gets Pakistan. Pakistan is moved to Australia. We, sadly, lose Sri Lanka and are sent to what looks like Uzbekistan (uncool). Where people live, of course, has more to do with chance and war than mathematical sense, but it is interesting to see how the world would look if it was divided up equally (34 people per mi²).