5 most western countries of each continent

I enjoyed the quiz but I'm not sure that it's right. I don't think that Mauritania is no 5 in Africa. Surely Morocco (if you count Western Sahara as part of it - or Western Sahara if you don't) extends further West? But then is not Spain slightly further West still (Hierro)? And I don't get the Denmark thing in Europe. The Faroes are the most westerly point but clearly not as far West as Iceland or Ireland - you surely aren't thinking of Greenland, because that isn't part of Europe. Neither is Madeira. Rockall on the other hand is (and is owned by UK) and I reckon is further West than both Ireland and Portugal.