Based on the Travelers' Century Club (TCC) list of "countries" GEOGRAPHICALLY, POLITICALLY OR ETHNOLOGICALLY REMOVED from their parent countries.
The TCC has a list of "countries", a total of 321 as of July 2011, that determine eligibility for membership. TCC members must have visited at least 100 of 321 "countries" on this list. All but 4 countries on the Sporcle Countries of the World list are also on the full TCC list. Two of those COTW countries (UK & UAE) are broken into their geographic or political components for this quiz, and the others are countries that span two continents, and therefore listed twice in this quiz.