@Bartleby: You misunderstand: the CIA World Factbook lists many overseas dependencies that aren't countries but it never claims that they are countries. So, if you follow the link from the source list to the Pitcairn Islands (population 48), you'll see that the header says
Australia-Oceania :: Pitcairn Islands
(Overseas territory of the UK)
Unless I made a mistake in filtering out the non-countries, this list represents the world's 25 least populous sovereign nations. |