Most Western, Northern, Southern, and Eastern Country by Continent

It's a good idea, but it has issues. If you're including overseas territories by including Greenland, then many of these answers are incorrect. South America Western would be Ecuador due to the overseas islands of Isla Isabel and the Portuguese islands of Acores are further west than Iceland. You should also mention whether we're looking for only countries in that continent or any territory from any country (the latter is implied through Greenland). Since I think this also changes answers.