This was really cool! Only one I had no idea on was Attu, but I got it on my 2nd guess just by playing probabilities. One issue though, is that apparently Nicaragua is acceptable for Jamaica, but isn't being accepted, only Honduras.
You're probably right, but given that the point jutting farthest out into the ocean is bisected by the border, I can understand the quiz-maker giving both answers, even if Jamaica being marginally north of that line makes a small difference.
So I thought, but looking on Google maps, the Parque Nacional Guanahacabibes seems to put the mexican mainland within questionable range as opposed to the floridian mainland(not Key West).
I would love feedback and suggestions on it!
Additionally, if Ireland is considered an island and no main land, then neither is the united Kingdom mainland, as they are both islands!