It's great to see my hard work getting some attention. I developed my COUNTRIES NOT VISITED BY AN AMAZING RACE list by subtracting from the list of major countries the list of every country ever visited by an Amazing Race. Although my actual list of that is comprehensive, this is a manual taskand there were some errors in the transfer of that list for that comparison. I did miss some countries for the FIRST TIME VISIT list, but I did not have them not on the COUNTRIES NOT VISITED list so it is clear what my intent was.
David Junior, yes AR3 did go to Mexico and to Portugal. Should they be on the FIRST TIME VISIT list for AR3? Yes, it was an oversight as explained above.
Raymond, Mauritius (AR10), Mongolia (AR10) and Taiwan (AR12) should also all be on the list. They too were oversights, as they are on my master list of countries.
However, Kenya is not valid per my definition of what a visit means. Nairobi Airport was only a place to transfer through on the way to Lake Manyara Lookout, Tanzania and back in episodes 7 and 8. Lake Manyara is southwest of Arusha, Tanzania so there is no way teams could have crossed into Kenya on the way. There were no tasks in Nairobi or elsewhere in Kenya to the best of my knowledge. In AR11 Oswald/Danny and Charla/Mirna connected in Nairobi Airport on the way from Zanzibar to Warsaw. However, again airport connections do not count as a visit.